subtend /səb-tendˈ/

1. To be opposite to (as a hypotenuse is to a right-angle) or to extend under (as a chord does an arc) (geometry)
2. To be situated immediately below (as a leaf is to a bud in its axil) (botany)

subtenseˈ noun

A subtending line

Placed so as to subtend an angle, as a rod or bar used as a distance base in tacheometry

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