Definition of pisidiid in English:

pisidiid

Pronunciation /pɪˈsɪdɪɪd/

noun

rare Zoology
  • A member of the family Pisidiidae of small, rounded, freshwater bivalve molluscs having fused siphons; a pea mussel, a pea shell.

adjective

Zoology
  • Of or relating to the family Pisidiidae of freshwater bivalve molluscs.

Origin

Late 19th century; earliest use found in Isaac Funk (1839–1912), publisher and reformer. From scientific Latin Pisidiidae, family name, alteration of Pisidiadae (J. E. Gray 1857) from Pisidium, genus name + -idae.