Trap"e*zoid (?), n. [Gr. &?; trapezoid- shaped; &?; table + &?; shape, likeness: cf. F. trapézoïde. See Trapezium.] 1. (Geom.) A plane four-sided figure, having two sides parallel to each other.

2. (Anat.) A bone of the carpus at the base of the second metacarpal, or index finger.

Trap"e*zoid, a. 1. Having the form of a trapezoid; trapezoidal; as, the trapezoid ligament which connects the coracoid process and the clavicle.

2. (Anat.) Of or pertaining to the trapezoid ligament; as, the trapezoid line.

Trap"e*zoid (?), n. [Gr. &?; trapezoid- shaped; &?; table + &?; shape, likeness: cf. F. trapézoïde. See Trapezium.] 1. (Geom.) A plane four-sided figure, having two sides parallel to each other.

2. (Anat.) A bone of the carpus at the base of the second metacarpal, or index finger.

Trap"e*zoid, a. 1. Having the form of a trapezoid; trapezoidal; as, the trapezoid ligament which connects the coracoid process and the clavicle.

2. (Anat.) Of or pertaining to the trapezoid ligament; as, the trapezoid line.

• (geometry) (UK) A convex quadrilateral with no two sides parallel (known as a trapezium in US English).
  
• (geometry) (US) A convex quadrilateral with two non-adjacent parallel sides (called a trapezium in British English).
  
• (anatomy) The trapezoid bone of the wrist.