‖Cath″e‐tus (?), n.; pl.catheti (#). [L., fr. Gr. � a perpendicular line, fr. � let down, fr. �. See Catheter.] (Geom.) One line or radius falling perpendicularly on another; as, the catheti of a right-angled triangle, that is, the two sides that include the right angle. Barlow.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.