(geology) Of a geologic era within the Archaean eon from about 3200 to 2800 million years ago; stromatolites have existed from this time.

(music, uncountable) A musical form having a rhythm characterized by strong syncopation in the melody with a regularly accented accompaniment. / (music, countable) A piece of music in this style.

(historical) A medical practitioner of medieval Europe, generally charged with looking after soldiers during or after a battle.

pyrrhic