subtend - WordReference.com Dictionary of English

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- - substituent
  - substitute
  - substitution
  - substrate
  - substratum
  - substructure
  - subsume
  - subsurface
  - subsystem
  - subtenant
  - subtend
  - subterfuge
  - subterminal
  - subterranean
  - subtext
  - subtilize
  - subtitle
  - subtle
  - subtonic
  - subtopia
  - subtotal
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subtend

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Concise Oxford English Dictionary © 2008 Oxford University Press:
subtend /sʌbˈtɛnd/

▶verb

1 Geometry (of a line, arc, etc.) form (an angle) at a particular point when straight lines from its extremities meet.
■ (of an angle or chord) have bounding lines or points that meet or coincide with those of (a line or arc).

2 Botany (of a bract) extend under (a flower) so as to support or enfold it.

– origin C16: from L. subtendere, from sub- ‘under’ + tendere ‘stretch’.

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