-cide

-cide

a learned borrowing from Latin meaning “killer,” “act of killing,” used in the formation of compound words: pesticide, homicide.

Origin:
late Middle English < Latin -cīda killer, -cīdium act of killing, derivatives of caedere to cut down, kill (in compounds -cīdere)

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World English Dictionary
-cide
 
n combining form
1.  indicating a person or thing that kills: insecticide
2.  indicating a killing; murder: homicide
 
[from Latin -cīda (agent), -cīdium (act), from caedere to kill]
 
-cidal
 
adj combining form

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

-cide
"killer," from Fr. -cide, from L. -cida "cutter, killer, slayer," from -cidere, comb. form of caedere "to strike down, chop, beat, hew, fell, slay," from PIE *kae-id-, from base *(s)k(h)ai- "to strike" (Pokorny, not in Watkins; cf. Skt. skhidati "beats, tears," Lith. kaisti "shave.") For L. vowel change,
see acquisition. The element also can represent "killing," from Fr. -cide, from L. -cidium "a cutting, a killing."
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

-cide suff.

  1. Killer: bactericide.

  2. Act of killing: suicide.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
-cide  
A suffix that means "a killer of." It is used to form the names of chemicals that kill a specified organism, such as pesticide, a chemical that kills pests.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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