外博词典,懂英语单词快速记忆法的在线英语词典

quadrilateral (n.)

"figure formed of four straight lines," 1640s, with -al (1) + Latin quadrilaterus, from quadri- "four" (from PIE root *kwetwer- "four") + latus (genitive lateris) "the side, flank of humans or animals, lateral surface," a word of uncertain origin. As an adjective, "four-sided, composed of four lines," from 1650s. Related: Quadrilaterally.

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