Causing; making: soporific.
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.
suffix forming adjectives
causing, making, or producing: honorific.
[from Latin -ficus, from facere to do, make]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
a combining form meaning “making,” “producing,” “causing” the thing specified by the initial element: honorific; pacific; prolific.
[< Latin derivative of facere to make, do1; in some words replacing -fique < Middle French < Latin]
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