English
anhydrase
From an- + hydrase.
Proto-Indo-European *h₂en- ‘on, onto’
Proto-Germanic *ana- ‘on’
Proto-West Germanic *ana- ‘Forming verbs and adjectives from participles…’
English an-
Today it means
noun An enzyme that catalyzes the removal of water from a material.
Language periods are conventional ranges, not dates for this word.
Etymograph / anhydrase