| 词源 |
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. updated on February 22, 2021 |