Dictionary
subor'dinate clause'
Gram.
a clause that modifies the principal clause or some part of it or that serves a noun function in the principal clause, as
when she arrived in the sentence
I was there when she arrived or
that she has arrived in the sentence
I doubt that she has arrived. Cf.
main clause. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.