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The combining form micro- has several meanings.

Meaning 1: small, minute

  • MVD, or microvascular disease, affects the smallest blood vessels in the body.
  • Microchipping—the insertion of a tiny computer chip under the skin—is a safe method of identifying your pet if it gets lost.

Meaning 2: one millionth

  • A microgram is one millionth of a gram.

Meaning 3: underdevelopment

  • A person who suffers from micropodia has abnormally small feet.

Meaning 4: involving a microscope

  • A micrometer is used to measure objects viewed through a microscope.