词根词缀：quadri-, quadra-, quad-, quadru-

【来源及含义】Latin: four, fourth; a word element for number 4

【相关词根词缀】 Cross references of word families that are related, partially or totally, to: "four, fourth": quatr-; tessara-; tetra-.

【同源单词】biquadrate, carillon, omniquadrante hora, quadragenarian, quadragenary, Quadragesima

词根词缀：valvulo-, valvul-

【来源及含义】Latin: a doorlike structure in a passageway that hinders or prevents the reflux or flowing back of its contents

【同源单词】bivalve, bivalved, bivalvular, cardiovalvulitis, equivalve, equivalvular