[gastropod] Cymbium is a genus of sea snails, marine gastropod mollusks in the family Volutidae. Species within the genus Cymbium include: ...
• (n.) A genus of marine univalve shells; the gondola.
Cym'bi·um noun [ Latin , a small cup, from Greek .............] (Zoology) A genus of marine univalve shells; the gondola. 
The broadened, hollowed-out tarsus of the male palp within which the palpal organs are attached.