Rotula

noun

noun ·Rare ·Advanced level

Definitions

Noun
  1. 1
    The patella; the kneecap.
  2. 2
    One of the five radial pieces in the dentary apparatus of the sea urchin.

Etymology

Learned borrowing from Latin rotula. Doublet of role and roll.

Related phrases

Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.