quadrilateral
n.
"four-sided," 1640s, with -al(1) + Latin quadrilaterus, from quadri- "four" (see quadri-) + latus (genitive lateris) "side" (see oblate, n.). As an adjective from 1650s. Related: Quadrilaterally.
〔李〕a.四边（形）的 [later=side] ←quadr（i）-，quadru-[L] =four四
〔蒋〕[quadric-四，later边] 四边的，四边形的，四方面的