Pronunciation: (ō), [key] French.
auxiliary verb: used to represent a phrase structure constituent that may include such verbal elements as tense and mood markers as well as auxiliaries. Also,Aux
var. of auxo-, esp. before a vowel: auxin.
auxiliary; auxiliaries. Also,aux,auxil.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.