SUBTEND
subtend, delimit
(verb) be opposite to; of angles and sides, in geometry
Source: WordNet® 3.1
Etymology
Verb
subtend (third-person singular simple present subtends, present participle subtending, simple past and past participle subtended)
(transitive, mathematics) 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.
(transitive, also mathematics) To extend or stretch opposite something; to be part of a straight or curved line that is opposite to and delimits an angle.
(transitive, mathematics) To form the central angle of a circle underneath an arc
Anagrams
• stub end
Source: Wiktionary
Sub*tend", v. t. [imp. & p. p. Subtended; p. pr. & vb. n.
Subtending.] Etym: [L. subtendere; sub under + tendere to stretch,
extend. See Tend.]
Definition: To extend under, or be opposed to; as, the line of a triangle
which subtends the right angle; the chord subtends an arc.
Source: Webster’s Unabridged Dictionary 1913 Edition