- to extend under or be opposite to in position: each side of a triangle subtends the opposite angle
- Bot. to enclose in an angle, as between a leaf and its stem
Origin of subtendClassical Latin subtendere ; from sub-, under + tendere, to stretch: see tend
transitive verbsub·tend·ed, sub·tend·ing, sub·tends
- Mathematics To be opposite to and delimit: The side of a triangle subtends the opposite angle.
- To underlie so as to enclose or surround: flowers subtended by leafy bracts.
Origin of subtendLatin subtendere, to extend underneath : sub-, sub- + tendere, to extend; see ten- in Indo-European roots.
(third-person singular simple present subtends, present participle subtending, simple past and past participle subtended)