sub·tend

[suhb-tend, suhb-]
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:
1560–70; < Latin subtendere to stretch beneath, equivalent to sub- sub- + tendere to stretch; see tend1

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Based on the Random House Dictionary, © Random House, Inc. 2013.
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World English Dictionary
subtend (səbˈtɛnd) [Click for IPA pronunciation guide]
 
vb
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
 
[C16: from Latin subtendere to extend beneath, from sub- + tendere to stretch out]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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00:10
Subtend is one of our favorite verbs.
So is peculate. Does it mean:
to steal or take dishonestly (money, esp. public funds, or property entrusted to one's care); embezzle.
to spend time idly; loaf.
Etymonline
Word Origin & History

subtend
1570, from L. subtendere, from sub "under" + tendere "to stretch" (see tenet).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
The flowers consist of four bracts which subtend the small head of yellow flowers.
The inflorescence is enclosed by a spathe of one or two scale leaves which subtend the first two flowers.
One or more series of bracts that subtend a flower or inflorescence.
The two monsters, nevertheless being exactly the same size in the drawing, subtend the same visual angle at the eye.
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