词根：crud = raw （生的）
crude a. 粗糙的；原始的
recrudesce （病等）复发（re再+crud+esce——再次变粗糙——复发）
词根词缀：crud-
【来源及含义】Latin: raw, not cooked; literally, trickling with blood, bleeding; raw, bloody, cruel
【相关描述】The terms, cruelty and crudeness are closely linked etymologically. Cruel came via Old French cruel from Latin crudelis, a relative of Latin crudus; which actually meant "cruel" as well as "raw" and "bloody".