verb (used with object)
Examples from the Web for subtend
Unless they subtend a high vertical angle to the vision they produce little effect.The Alps|Martin Conway
In like manner the two pale are bracteoles which subtend the flower proper.Grasses|H. Marshall Ward
Undersea, submarine; underspan, subtend; underslinking, subterfuge.An Outline of English Speech-craft|William Barnes
For this purpose the condenser should subtend as large an angle as possible at the source of light.
"Subtend" is from the Latin sub (under), and tendere (to stretch).The Teaching of Geometry|David Eugene Smith