subtend

[ suh b-tend, suhb- ]
/ səbˈtɛnd, sʌb- /

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
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for subtend

British Dictionary definitions for subtend

subtend

/ (səbˈtɛnd) /

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