Definition of rhynchostome in US English:

rhynchostome

noun

Zoology
  • In whelks and related gastropods, and in nemerteans: the anterior opening of the rhynchodaeum, through which the proboscis is everted.

Origin

Late 19th century; earliest use found in Journal of the Royal Microscopical Society. From rhyncho- + -stome, after German Rhynchostom.

Pronunciation

rhynchostome

/ˈrɪŋkə(ʊ)stəʊm/