The American Heritage® Dictionary of the English Language, 4th Edition
n. A rubber or plastic nipple or teething ring for a baby to suck or chew on.
the GNU version of the Collaborative International Dictionary of English
n. One who or that which pacifies.
n. A small device, usually of rubber or plastic containing a protruding nipple-shaped portion which a baby may place in its mouth and suck on; -- it is used to keep babies contented.
The Century Dictionary and Cyclopedia
n. One who pacifies.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. someone who tries to bring peace
n. device used for an infant to suck or bite on
n. anything that serves to pacify
Word Usage
"I agree about the word “suck” but I do use it often, mainly because my nephew calls his pacifier his “suck”."