trochus
nounDefinition of trochus
1a capitalized : a genus of chiefly Old World tropical marine gastropods (family Trochidae) with beautifully nacreous bluntly conical shells including a large Indo-Pacific species (T. niloticus) extensively used in making buttons and ornamental objects
b plural -es : top shell
2 plural trochi\-ōˌkī\ or trochuses : the inner preoral band of cilia of a trochal disc broadly : trochal disc
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