Definition of Acephala in English:

Acephala

noun

Zoology
historical
  • Treated as plural. A former class of invertebrates lacking distinct heads, broadly equivalent to Bivalvia (bivalve molluscs) but also including tunicates; (also in form acephala) invertebrates of this class collectively. Occasionally with singular concord (also in form acephala): an invertebrate of this class.

Origin

Early 19th century. From scientific Latin Acephala, plural noun, use as noun of post-classical Latin acephalus, after French acéphales, plural noun; compare scientific Latin -a.

Pronunciation

Acephala

/(ˌ)eɪˈsɛfələ//(ˌ)eɪˈsɛf(ə)lə//(ˌ)eɪˈkɛfələ/