Definition of actinostome in English:

actinostome

noun

Zoology
  • The mouth or oral opening of a radiate animal, such as a coelenterate or (now usually) an echinoderm.

Origin

Mid 19th century; earliest use found in Louis Agassiz (1807–1873), zoologist and geologist. From actino- + -stome.

Pronunciation:

actinostome

/ˈaktɪnə(ʊ)ˌstəʊm/