Part of speech: Noun
(anatomy) a long narrow slit or groove that divides an organ into lobes
Categories: Groove, Vallecula
Part of speech: Verb
break into fissures or fine cracks
Categories: Crack
Crevice, Crack, Cleft, Scissure, Fissure
The word "fissure" comes from Latin fissūra. It started in Old French fissure. Then it appeared in Middle English fissure.
Each language in this chain added phonetic changes that transformed the original sound.