trapezoid
Concise Oxford English Dictionary © 2008 Oxford University Press:
trapezoid /ˈtrapɪzɔɪd, trəˈpiːzɔɪd/
▶noun Geometry, Brit. a quadrilateral with no sides parallel.
■ N. Amer. a quadrilateral with one pair of sides parallel.
– derivatives
trapezoidal adjective.
trapezoidal adjective.
'trapezoid' also found in these Oxford entries:

