A morpheme is the smallest grammatical unit in a language. A morpheme is not identical to a word, and the principal difference between the two is that a morpheme may or may not stand alone, whereas a word, by definition, is freestanding. The linguistics field of study dedicated to morphemes is called morphology. When a morpheme stands by itself, it is considered as a root because it has a meaning of its own (e.g. the morpheme cat) and when it depends on another morpheme to express an idea, it is an affix because it has a grammatical function (e.g. the --s in cats to indicate that it is plural). Every word comprises one or more morphemes.

Is it true that a morpheme is the smallest unit of meaning found in a word. true false?
yes