also: ごくび
na-adjective, noun which may take the genitive case particle 'no', noun
microscopic; infinitesimal; extremely small
Describes something extremely small, often at a scale beyond normal perception. Used as a noun, adjectival noun (na-adjective), or prenominal (no-adjective).
この機械は極微の部品でできている。
This machine is made of microscopic parts.
極微な変化も見逃さない。
I don't overlook even the most infinitesimal changes.
Compound of 極 (extreme) and 微 (minute). The reading きょくび uses the on'yomi of both characters; ごくび is an alternative on'yomi reading of 極.