The Collaborative International Dictionary
Patellula
Patellula \Pa*tel"lu*la\, n.; pl. Patellul[ae]. [NL., dim. of L. patella. See Patella.] (Zo["o]l.) A cuplike sucker on the feet of certain insects.
Wiktionary
patellula
n. (context zoology English) A cup-like sucker on the foot of certain insects.