cupule
‘a small cup-shaped structure or organ, such as the cup at the base of an acorn or one of the suckers on the feet of certain flies’
Lexical development traced from the Tamil root:
Mod.Lat. cupula < Lat. cupa ‘cask, barrel’ < O.E. cuppe < O.Nort. copp < La.Lat. cuppa ‘cup’ < Lat. cupa ‘tub, cask, tun, barrel’ < kyoop < kup- < Tamil kappu