Definition of monomyarian in US English:

monomyarian

adjective

Zoology
  • Of a bivalve mollusc: having only one (posterior) adductor muscle; relating to or characteristic of such a mollusc. Formerly also: †belonging to the former group Monomyaria of bivalves (obsolete).

noun

Zoology
  • A bivalve mollusc of a type having only one (posterior) adductor muscle (e.g. an oyster).

Origin

Mid 19th century. From monomyary + -an; compare -ian.

Pronunciation

monomyarian

/ˌmɒnə(ʊ)mʌɪˈɛːrɪən/