An English variant form meaning a fissure or fracture running opposite to another; a counteracting crack or split.
From 'contra-' (against) + 'fissure' (from Latin 'fissura'). An anglicized version of the Latin 'contrafissura,' simplified for English usage.
This is basically the English spelling of the Latin medical term—showing how anatomy textbooks tried to make Latin technical terms sound less alien to English speakers.
Complete word intelligence in one call. Free tier — 50 lookups/day.