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 (trī-kwē′trəs, -kwĕt′rəs)
Three-sided, with sharp edges and concave sides: triquetrous seeds.

[From Latin triquetrus, three-cornered : tri-, tri- + -quetrus, -cornered.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(traɪˈkwiːtrəs; -ˈkwɛt-) or


triangular, esp in cross section: a triquetrous stem.
[C17: from Latin triquetrus having three corners]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(traɪˈkwi trəs, -ˈkwɛ-)

1. three-sided; triangular.
2. having a triangular cross section.
[1650–60; < Latin triquetrus; see -ous]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
References in periodicals archive ?
Achene is triquetrous, acute angle, longer than 5 mm, more than twice the length of the persistent perianth, brown or black-brown, and lucid [14].
Stems trigonous to triquetrous, glabrous, pubescent or scabridulous.