Etymology

reniform

ren·i·form
R1E1N1I1F4O1R1M3

Today it means: Synonym of kidney-shaped (“having an approximately circular or elongated ovoid shape with an inward curve or indentation on one side”). Full definition →

Latin rēnis ← New Latin rēnifōrmis
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The story

  1. New Latin · derived fromrēnifōrmis“of seeds: kidney-shaped”
  2. Latin · learned borrowing fromrēnis
  3. English todayreniform

Learned borrowing from Latin rēnis (the genitive singular of rēn (“kidney”); see further at that entry) + English -form (suffix meaning ‘having the form or shape of’), modelled after New Latin rēnifōrmis (“of seeds: kidney-shaped”).

Etymology from Wiktionary, CC BY-SA 4.0.