Webster's English Dictionary

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subtend

sub.tend \s*b-'tend\ vt [L subtendere to stretch beneath, fr. sub- + 
   tendere to stret]ch - more at THIN 1a: to be opposite to {a hypotenuse ~s a 
   right angle}  1b: to extend under and mark off or enclose {a chord ~s an a 
   rc} 2: to underlie so as to include