Definition of subtend
1a : to be opposite to and extend from one side to the other of a hypotenuse subtends a right angleb : to fix the angular extent of with respect to a fixed point or object taken as the vertex a central angle subtended by an arc the angle subtended at the eye by an object of given width and a fixed distance awayc : to determine the measure of by marking off the endpoints of a chord subtends an arc
2a : to underlie so as to includeb : to occupy an adjacent and usually lower position to and often so as to embrace or enclose a bract that subtends a flower
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