资料来源 : pyDict

弦,对边

资料来源 : Webster's Revised Unabridged Dictionary (1913)

Subtense \Sub*tense"\, n. [L. subtendere, subtentum. See
   {Subtend}, {Tense}, a.] (Geom.)
   A line subtending, or stretching across; a chord; as, the
   subtense of an arc.