-philiacsuff.1. One that has a tendency toward: hemophiliac.2. One that has an abnormal attraction to: coprophiliac.[-phili(a) + -ac.]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.-philiac a combining form occurring in personal nouns that correspond to nouns ending in -philia: hemophiliac; necrophiliac. [