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[troh-kuh l]
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adjective Zoology.
  1. resembling a wheel.

Origin of trochal

1835–45; < Greek troch(ós) wheel + -al1
Related formspre·tro·chal, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for trochal

Historical Examples

  • On the sides of the ventral depression are two ridges which form the lateral boundaries of the trochal disc.

    The Works of Francis Maitland Balfour, Volume II (of 4)

    Francis Maitland Balfour

  • At a later period the lateral ridges of the trochal disc meet dorsally and so enclose the proral lobe.

British Dictionary definitions for trochal


  1. zoology shaped like a wheelthe trochal disc of a rotifer

Word Origin

C19: from Greek trokhos wheel
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012