subtend

Pronunciation: /sʌbˈtɛnd/

The English word “subtend” has 4 meanings listed here.

verb

To use an angle to delimit (mark off, enclose) part of a straight or curved line, for example an arc or the opposite side of a triangle.
To extend or stretch opposite something; to be part of a straight or curved line that is opposite to and delimits an angle.
To form the central angle of a circle underneath an arc.
To stand beneath or close to, as a bract at the base of a flower.

Etymology

From Latin subtendere, from sub (“under”) + tendere (“to stretch, extend”), itself a semantic loan from Ancient Greek ὑποτείνω (hupoteínō, “to subtend”), from which hypotenuse also derives. See tend.

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Definitions are from Wiktionary, extracted by Kaikki.org, and are available under the CC BY-SA 4.0 licence.