词根：-cad-, -cid-, -cas-

【词根含义】：落下,降临,发生

【词根来源】：来源于拉丁语动词cado, cadere, cecidi, casus(落下), 落下意味着降临, 降临意味着意外发生。

【同源单词】：decadence, decay, accident, accidental, accidentally

词根：-cis-, -cid-

【词根含义】：切

【词根来源】：来源于拉丁语动词caedo, caedere, cecidi, caesus(砍,劈)。

【同源单词】：circumcision, concise, concision, decision, decisive

前缀：ac-

【词根含义】：来,临近;加强意义

【词根来源】：ad-的变体,用在c前。

【同源单词】：accede, accelerate, acceleration, accelerator, accelerometer

词根词缀：-al, -ial, -eal

【来源及含义】Latin: suffix; pertaining to, like, of the kind of, relating to, characterized by, belonging to; action of, process of

【同源单词】abacterial, abdominal, abdominal adhesion, abdominal aorta, abdominal aortic aneurysm, abdominal aortography

词根词缀：cad-, cas-, cid-

【来源及含义】Latin: to fall, befall

【相关词根词缀】 A cross reference of other word family units that are related directly, or indirectly, to: "chance, luck, fate": aleato-; auspic-; fortu-; -mancy; serendipity; sorc-; temer-; tycho-.

【同源单词】accidence, accident, accidental, accidentally, accidently, cadaver