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

词根词缀：bacterio-, bacteri-, bacter-, -bacteria, -bacterial, -bacterially, -bacterium

【来源及含义】Greek: rod-shaped micro-organism; used in biomedical terminology

【同源单词】Agrobacterium, archaebacterium, archaeobacterium, bacteremia, bacterial, bactericidal

词根词缀：-cide, -cides, -cidal

【来源及含义】Latin: a suffix; kill, killer; murder, to cause death, slayer; cutter; “to cut down”

【相关描述】Don’t confuse this element with the another -cide that means “to cut”; although -cide, “death”, is related to -cise, -cide, “to cut down”.

【相关词根词缀】 Related "death, dead; kill" units: lethal-; mort-; neci-; necro-; phono-; thanato-.

【同源单词】aborticide, acaricide, adulticide, algaecide, algicide, algiocide