Definition of mesogastropod in US English:

mesogastropod

noun

Zoology
  • A prosobranch gastropod of the order Mesogastropoda, comprising chiefly marine molluscs which possess only one monopectinate gill, auricle, and nephridium, and a radula with seven teeth in a transverse row.

Origin

1950s; earliest use found in Philosophical Transactions of the Royal Society of London. From scientific Latin Mesogastropoda, order name from meso- + Gastropoda.

Pronunciation

mesogastropod

/ˌmɛsə(ʊ)ˈɡastrəpɒd/