trochus
noun
tro·chus
ˈtrōkəs
1
a
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
Word History
Etymology
New Latin, from Latin, wheel, iron hoop, from Greek trochos wheel