in·fan·ti·cide (?n-f?n?t?-s?d?)n.1. The act of killing an infant.2. The practice of killing newborn infants.3. One who kills an infant.[Late Latin ?nfantic?dium, the killing of a child and ?nfantic?da, killer of a child : Latin ?nf?ns, ?nfant-, infant; see infant + Latin -c?dium and -c?da, -cide.]in·fan?ti·cid?al (-s?d?l) adj.American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.infanticide (?n?fænt??sa?d) n1. the killing of an infant2. the practice of killing newborn infants, still prevalent in some primitive tribes3. a person who kills an infant in?fanti?cidal adjCollins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014in?fan?ti?cide (?n?fæn t??sa?d) n. 1. the act of killing an infant. 2. a person who kills an infant. [1650?60;