triquetra

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tri·quet·ra 1

(trī-kwĕt′rə, -kwē′trə)
n. pl. tri·quet·rae (-trē) or tri·quet·ras
A figure consisting of three arcs joined at the ends and interlaced, used in various traditions as a religious or heraldic symbol.

[Latin, feminine of triquetrus, three-cornered; see triquetrous.]

tri·quet·ra 2

(trī-kwĕt′rə, -kwē′trə)
n.
Plural of triquetrum.
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.

triquetra

(traɪˈkwiːtrə)
n
an ornament in the shape of three intersecting ellipses roughly forming a triangle
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014