Definition of gammaridean in US English:

gammaridean

adjective

Zoology
  • Of or relating to amphipods of the large suborder Gammaridea, comprising the gammarids and allied shrimp-like aquatic forms; designating such amphipods.

noun

Zoology
  • An amphipod of the suborder Gammaridea.

Origin

Early 20th century. From gammarid + -ean, after scientific Latin Gammaridea, suborder (originally subtribe) name.

Pronunciation

gammaridean

/ˌɡaməˈrɪdɪən/