a combining form meaning “four,” used in the formation of compound words:
four: quadrilateral, quadrilingual, quadrisyllabic
before vowels quad- (before -p- often quadru-, from an older form in Latin), word-forming element meaning “four, four times, having four, consisting of four,” from Latin quadri-, related to quattor “four” (see four).
quadri- or quadr-
[kwod-ree-ad] /ˈkwɒd riˌæd/ noun 1. a group of four, especially a group of four persons with an interest or task in common.
quadribasic quad·ri·ba·sic (kwŏd’rə-bā’sĭk) adj. Of or relating to an acid having four hydrogen atoms that are replaceable by atoms or radicals that are basic.
[kwod-rik] /ˈkwɒd rɪk/ Mathematics adjective 1. of the second degree (said especially of functions with more than two variables). noun 2. a quadric function. 3. a surface such as an ellipsoid or paraboloid as defined by a second-degree equation in three real variables. /ˈkwɒdrɪk/ adjective 1. having or characterized by an equation of the second […]
[kwod-ruh-sen-ten-uh-ree, -sen-tn-er-ee; especially British kwod-ruh-sen-tee-nuh-ree] /ˌkwɒd rə sɛnˈtɛn ə ri, -ˈsɛn tnˌɛr i; especially British ˌkwɒd rə sɛnˈti nə ri/ noun, plural quadricentenaries, adjective 1. .