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Latin word -cida comes from Latin caedo, Latin -a
caedo (Latin)
Cut, hew, fell.. Defeat decisively (defeat with heavy losses to the enemy side).. Kill.. Strike, beat.
-a (Latin)
suffixed to the roots of verbs, forms (usually masculine) agent nouns suffixed chiefly to the stems of adjectives terminating in -ter, forms adverbs which are frequently also used as prepositions.
-cida (Latin)
Noun-forming suffix denoting “one who kills” or “one who cuts” from nouns stems.