TERMIUM Plus®

The Government of Canada’s terminology and linguistic data bank.

LEUCO [12 records]

Record 1 2017-05-12

English

Subject field(s)
  • Petrography
DEF

Applied to an igneous rock rich in light-colored minerals and poor in mafic minerals.

OBS

As opposed to "melanocratic."

OBS

The prefix "leuco-", meaning "light-colored" is often used before a name of rock, e. g. leucogabbro.

OBS

leucocratic : term used at Natural Resources Canada - Earth Sciences Sector.

PHR

leucocratic breccia, leucocratic granite

Key term(s)
  • leuco

French

Domaine(s)
  • Pétrographie
DEF

S'applique aux roches magmatiques riches en minéraux blancs.

CONT

La proportion des minéraux foncés, facilement appréciable au simple coup d'œil, fournit une classification abrégée [des roches ignées], mais évidemment moins précise. On distingue les groupes suivants : [...] Roches leucocrates 5 à 35 [% de minéraux foncés].

OBS

leuco- : Préfixe couramment utilisé devant des noms de roches leucocrates. Ex. : leucogabbro.

OBS

leucocrate : terme en usage à Ressources naturelles Canada - Secteur des sciences de la Terre.

PHR

brèche leucocrate, granite leucocrate

Key term(s)
  • leuco

Spanish

Campo(s) temático(s)
  • Petrografía
Save record 1

Record 2 2012-02-07

English

Subject field(s)
  • The Skin
CONT

Vitiligo is more commonly known as leucoderma, which simply means white(leuco) skin(derma), i. e. a skin disorder where it looses its normal coloration. It is also medically known as achromia, which means loss of color.

French

Domaine(s)
  • Appareil cutané
DEF

Absence de la coloration; spécifiquement, dépigmentation de la peau.

CONT

[Le vitiligo est] une achromie circonscrite acquise, mais déterminée génétiquement dans plus d'un tiers des cas, pouvant apparaître à tout âge; il est l'apanage de l'adulte jeune.

Spanish

Campo(s) temático(s)
  • Piel
Save record 2

Record 3 2011-03-15

English

Subject field(s)
  • Chemical Elements and Compounds
Universal entry(ies)
C6H5CH(C6H4N(CH3)2)2
formula, see observation
C23H26N2
formula, see observation
129-73-7
CAS number
DEF

A chemical compoundwhich appears under the form of a white to off-white powder with greenish cast, has a molecular weight of 330.48 and a melting point between 99 and 103°C.

CONT

+ leuco bases : Colourless compounds formed by reduction of triphenylmethane dyes. Generally, they are amino or hydroxy derivatives of triphenylmethane. Use of this class name, which is more or less parochial to the technology of dyes, is not endorsed. E. g.(p-Me2NC6H4) 2CHPh, the leuco base of Malachite Green. [The prefix "p-"in the chemical formula must be italicized. ]

CONT

... chemical solutions used to enhance bloody impressions. ... in recent years, various RFISS members have been using other reagents [than Amido Black] (luminol, leucomalachite green, for example), so it was thought that we should test all of the various solutions ...

OBS

4,4’-(phenylmethylene)bis(N,N-dimethylaniline): The capital letters "N" must be italicized; form recommended by the IUPAC (International Union of Pure and Applied Chemistry).

CONT

Chemical formula: C6H5CH(C6H4N(CH3)2)2 or C23H26N2

French

Domaine(s)
  • Éléments et composés chimiques
Entrée(s) universelle(s)
C6H5CH(C6H4N(CH3)2)2
formula, see observation
C23H26N2
formula, see observation
129-73-7
CAS number
DEF

Produit chimique se présentant sous la forme d'une poudre blanche ou blanchâtre, de masse moléculaire relative de 330.48 et dont le point de fusion se situe entre 99 et 103 °C.

CONT

leucobase (base leuco); leuco base : Composé incolore résultant de la réduction d'un colorant dérivé du groupe du triphénylméthane. Généralement, ce sont des dérivés hydroxylés ou aminés du triphénylméthane. L'emploi de ce nom de classe, qui est plus ou moins particulier à la technologie des colorants, n'est pas recommandé. Par exemple : (p-Me2NC6H4)2CHPh, leucobase du vert Malachite. [Le préfixe «p-» dans la formule chimique s'écrit en italique.]

OBS

4,4'-(phénylméthylène)bis(N,N-diméthylaniline) : Les lettres majuscules «N» s'écrivent en italique; forme recommandée par l'UICPA (Union internationale de chimie pure et appliquée).

OBS

Formule chimique : C6H5CH( C6H4N(CH3)2)2 ou C23H26N2

Spanish

Save record 3

Record 4 2009-10-21

English

Subject field(s)
  • Chemical Elements and Compounds
Universal entry(ies)

French

Domaine(s)
  • Éléments et composés chimiques
Entrée(s) universelle(s)

Spanish

Save record 4

Record 5 2009-10-19

English

Subject field(s)
  • Chemical Elements and Compounds
Universal entry(ies)

French

Domaine(s)
  • Éléments et composés chimiques
Entrée(s) universelle(s)

Spanish

Save record 5

Record 6 2009-10-19

English

Subject field(s)
  • Chemical Elements and Compounds
  • Dyes and Pigments (Industries)
Universal entry(ies)
OBS

A Color Index name.

OBS

The Color Index Name is a type of international shorthand for identifying colors. The name consists of the following parts: The category and type of dye or pigment. General hue. Assigned number.

French

Domaine(s)
  • Éléments et composés chimiques
  • Teintures et pigments (Industries)
Entrée(s) universelle(s)

Spanish

Save record 6

Record 7 2009-09-28

English

Subject field(s)
  • Chemical Elements and Compounds
Universal entry(ies)

French

Domaine(s)
  • Éléments et composés chimiques
Entrée(s) universelle(s)

Spanish

Save record 7

Record 8 2003-10-29

English

Subject field(s)
  • Chemistry
  • Dyes and Pigments (Industries)
DEF

A group of colorless derivatives of triphenylmethane produced by the reduction of dyes which, on oxidation, are reconverted into the dye.

OBS

leuco bases : Colourless compounds formed by reduction of triphenylmethane dyes. Generally, they are amino or hydroxy derivatives of triphenylmethane. Use of this class name, which is more or less parochial to the technology of dyes, is not endorsed. E. g.(p-Me2NC6H4) 2CHPh, the leuco base of Malachite Green. [The prefix "p-"in the chemical formula must be italicized. ]

French

Domaine(s)
  • Chimie
  • Teintures et pigments (Industries)
DEF

Composé incolore résultant de la réduction d'un colorant dérivé du groupe du triphénylméthane.

OBS

Généralement, ce sont des dérivés hydroxylés ou aminés du triphénylméthane. L'emploi de ce nom de classe, qui est plus ou moins particulier à la technologie des colorants, n'est pas recommandé. Par exemple : (p-Me2NC6H4)2CHPh, leucobase du vert Malachite. [Le préfixe «p-» dans la formule chimique s'écrit en italique.]

Spanish

Save record 8

Record 9 1998-12-24

English

Subject field(s)
  • Dyes and Pigments (Industries)
Key term(s)
  • fluorane leuco dye

French

Domaine(s)
  • Teintures et pigments (Industries)

Spanish

Save record 9

Record 10 1989-10-04

English

Subject field(s)
  • Dyes and Pigments (Industries)
  • Textiles: Preparation and Processing
DEF

A class of dyes that can be easily reduced, i. e., vatted, to a soluble and usually colorless leuco form in which they can readily impregnate fibers. Subsequent oxidation then produces the insoluble colored dyestuff in a form that is remarkably fast to washing, light and chemicals.

French

Domaine(s)
  • Teintures et pigments (Industries)
  • Apprêt et traitements divers (Textiles)
CONT

Colorant de cuve. Ces colorants se présentent sous la forme de pigments insolubles dans l'eau, et il est nécessaire de les transformer, au moyen d'un agent réducteur en milieu alcalin, en leurs leucodérivés sodiques ou potassiques solubles et doués d'affinité pour les fibres cellulosiques.

Spanish

Save record 10

Record 11 1986-12-23

English

Subject field(s)
  • Dyes and Pigments (Industries)
  • Textiles: Preparation and Processing
CONT

Solubilized vat dyes are the sodium salts of the sulfuric mono-esters of the leuco compounds of vat dyes, are more expensive than ordinary vat dyes, and hence are used mainly for dyeing pastels on cotton, rayon, and linen....

French

Domaine(s)
  • Teintures et pigments (Industries)
  • Apprêt et traitements divers (Textiles)
CONT

Colorants de cuve solubilisés. Ces colorants résultent d'une transformation chimique des colorants de cuve en composés directement solubles dans l'eau. Les teintures obtenues possèdent les excellentes solidités des colorants de cuve dont ils dérivent, mais le prix élevé de ces colorants limite leur emploi à la réalisation de nuances claires.

Spanish

Save record 11

Record 12 1975-03-11

English

Subject field(s)
  • Dyes and Pigments (Industries)
  • Textiles: Preparation and Processing
OBS

--the colorless or nearly colorless soluble compound obtained by the reduction of a dye. An example would be the compound formed by reducing a vat dye.

French

Domaine(s)
  • Teintures et pigments (Industries)
  • Apprêt et traitements divers (Textiles)
OBS

--nom générique de substances incolores constituant des produits de réduction de certains colorants.

Spanish

Save record 12

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