[suh b-tend, suhb-]

verb (used with object)

Geometry. to extend under or be opposite to: a chord subtending an arc.
Botany. (of a leaf, bract, etc.) to occur beneath or close to.
to form or mark the outline or boundary of.

Origin of subtend

1560–70; < Latin subtendere to stretch beneath, equivalent to sub- sub- + tendere to stretch; see tend1 Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Related Words for subtend

traverse, span, unite, join, bind, couple, reach, cross, attach, link, branch

Examples from the Web for subtend

Historical Examples of subtend

British Dictionary definitions for subtend


verb (tr)

geometry to be opposite to and delimit (an angle or side)
(of a bract, stem, etc) to have (a bud or similar part) growing in its axil
to mark off
to underlie; be inherent in

Word Origin for subtend

C16: from Latin subtendere to extend beneath, from sub- + tendere to stretch out
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

Word Origin and History for subtend

1560s, from Latin subtendere, from sub "under" (see sub-) + tendere "to stretch" (see tenet). Related: Subtended; subtending.

Online Etymology Dictionary, © 2010 Douglas Harper