In morphology, a bound morpheme is a morpheme that appears only as part of a larger word; a free morpheme or unbound morpheme is one that can stand alone or can appear with other lexemes. A bound morpheme is also known as a bound form, and similarly a free morpheme is a free form.
Noun 1. a morpheme that occurs only as part of a larger construction; eg an -s at the end of plural nouns (synonym) bound form (hypernym) morpheme (hyponym) combining form