Definition of trochus
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
2
plural trochi\-ōˌkī\
or trochuses
: the inner preoral band of cilia of a trochal disc;
broadly
: trochal disc
