[suhb-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.

1560–70; < Latin subtendere to stretch beneath, equivalent to sub- sub- + tendere to stretch; see tend1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
subtend (səbˈtɛnd)
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
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1570, from L. subtendere, from sub "under" + tendere "to stretch" (see tenet).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences for subtended
The apex of the stem is topped by a round flower head, subtended by two leaves.
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