micro-, micr-

(Greek: small, tiny; also, a decimal prefix used in the international metric system for measurements)

One millionth part of [something]; in the metric system: 10^-6 [0.000 001].

Related "few, small, less, little" word units: mini-; mio-, meio-; nano-; oligo-, olig-.

Related "metric" families: yotta; zetta; exa; peta; tera; giga; mega; kilo; hecto; deka; deci; centi; milli; nano; pico; femto; atto; zepto; yocto.