Antonyms of noun trapezium

1 of 3 senses of trapezium

Sense 1
trapezium -- (a quadrilateral with no parallel sides)
       Antonym of parallelogram (Sense 1)
      => parallelogram -- (a quadrilateral whose opposite sides are both parallel and equal in length)

Synonyms/Hypernyms (Ordered by Estimated Frequency) of noun trapezium

3 senses of trapezium

Sense 1
trapezium -- (a quadrilateral with no parallel sides)
       => quadrilateral, quadrangle, tetragon -- (a four-sided polygon)

Sense 2
Trapezium -- (a multiple star in the constellation of Orion)
       => multiple star -- (a system of three or more stars associated by gravity)

Sense 3
trapezium, trapezium bone, os trapezium -- (the wrist bone on the thumb side of the hand that articulates with the 1st and 2nd metacarpals)
       => carpal bone, carpal, wrist bone -- (any of the eight small bones of the wrist of primates)