ICabbr.1. integrated circuit2. intensive careAmerican 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.IC abbreviation for 1. (Automotive Engineering) internal-combustion 2. (Electronics) electronics integrated circuit 3. (Telecommunications) text messaging I see 4. (Grammar) (in transformational grammar) immediate constituent 5. (Astrology) astrology Imum Coeli: the point on the ecliptic lying directly opposite the Midheaven Collins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014-ic 1. a suffix forming adjectives from other parts of speech, occurring orig. in Greek and Latin loanwords (metallic; poetic; archaic; public) and, on this model, used as an adjective-forming suffix with the particular senses ?having some characteristics of? (opposed to the simple attributive use of the base noun) (balletic; sophomoric); ?in the style of? (Byronic; Miltonic); ?pertaining to a family of peoples or languages? (Finnic; Semitic; Turkic). 2. a suffix, specialized in opposition to -ous, used to show the higher of two valences: ferric chloride. 3. a noun suffix occurring in loanwords from Greek, where such words were orig. adjectival (critic; magic; music). [Middle English -ic, -ik