cy·clo·pe·di·a also cy·clo·pae·di·a (s??kl?-p??d?-?)n. An encyclopedia.[Short for encyclopedia.]cy?clo·pe?dic (-d?k) adj.cy?clo·pe?dist (-d?st) n.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.cyclopedia, cyclopaediaencyclopedia. ? cyclopedist, cyclopaedist, n. ? cyclopedic, cyclopaedic, adj.See also: Books-Ologies & -Isms. Copyright 2008 The Gale Group, Inc. All rights reserved.