a morpheme is the smallest meaningful unit in a word.
e,g. cat is a free morpheme
unhappy consists of two morphemes : a free morpheme ( happy)and a bound morpheme (un)
An allomorph is one of two or more complementary morphs which manifest a morpheme in its different phonological or morphological environments.
for example the plural 's' has three allomorphs
/s/ cats
/z/ dogs
/iz/ buses
also the ir/il/un/im are allomorphs for the negative
2011年4月12日
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allomorph = any of the variant forms of a morpheme. For example, the phonetic (s) of cats (kts), (z) of pigs (pgz), and (z) horses (hôrsz) are allomorphs of the English plural morpheme.