an·al·ge·si·a (?n??l-j??z?-?, -zh?)n. A deadening or absence of the sense of pain without loss of consciousness.[Greek analg?si? : an-, without; see a-1 + alg?si?, pain (from algein, to feel pain, from algos, pain).]an?al·get?ic (-j?t??k) 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.analgesia (?æn?l?d?i?z??; -s??) or analgian1. (Medicine) inability to feel pain2. (Medicine) the relief of pain[C18: via New Latin from Greek: insensibility, from an- + alg?sis sense of pain]Collins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014an?al?ge?si?a (?æn l?d?i zi ?, -si ?) n. absence of sense of pain. [1700?10;