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subtend

[suh b-tend, suhb-] /səbˈtɛnd, sʌb-/
verb (used with object)
1.
Geometry. to extend under or be opposite to:
a chord subtending an arc.
2.
Botany. (of a leaf, bract, etc.) to occur beneath or close to.
3.
to form or mark the outline or boundary of.
Origin of subtend
1560-1570
1560-70; < Latin subtendere to stretch beneath, equivalent to sub- sub- + tendere to stretch; see tend1
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for subtend

subtend

/səbˈtɛnd/
verb (transitive)
1.
(geometry) to be opposite to and delimit (an angle or side)
2.
(of a bract, stem, etc) to have (a bud or similar part) growing in its axil
3.
to mark off
4.
to underlie; be inherent in
Word Origin
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
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Word Origin and History for subtend
v.

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

Online Etymology Dictionary, © 2010 Douglas Harper
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10
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