trapezoidal

WordReference Random House Learner's Dictionary of American English © 2025

trap•e•zoid /ˈtræpəˌzɔɪd/   n. [countable]

1. Mathematics a four-sided figure having two sides that are parallel and two sides that are not parallel.

trap•e•zoi•dal, adj. 

WordReference Random House Unabridged Dictionary of American English © 2025

trap•e•zoid  (trap′ə zoid′), n. 

1. [Geom.]
   • a quadrilateral plane figure having two parallel and two nonparallel sides.
   • [Brit.] trapezium (def. 1b).
2. [Anat.] a bone in the wrist that articulates with the metacarpal bone of the forefinger.

adj. 

3. Also, trap′e•zoi′dal.[Geom.] of, pertaining to, or having the form of a trapezoid.

• Late Greek trapezoeidé̄s trapeziumlike. See trapezium, -oid
• Neo-Latin trapezoīdēs
• 1695–1705