Definition of monostomatous in English:

monostomatous

Pronunciation /ˌmɒnə(ʊ)ˈstəʊmətəs/ /ˌmɒnə(ʊ)ˈstɒmətəs/

adjective

Zoology
  • Having only one mouth or opening; especially (of a coral) solitary, not colonial.

Origin

Late 19th century. From mono- + -stomatous, after monostome.