Degema has a ten-vowel system in which vowels can be divided into two
neat sets of five each, distinguished by tongue root. This paper clarifies how vowels of both
sets are restricted from co-occurring in simple words and presents a detailed examination of
vowel harmony across morpheme boundary, showing that vowels in affixes harmonize with
vowels in roots. It also illustrates how vowels in proclitics and enclitics harmonize with host
vowels in a clitic=host (=clitic)/host=clitic combination. Similarly, it shows that the vowels
in some possessive pronouns and demonstrative nominals harmonize with vowels in the head
noun in a noun-modifier construction, and that the vowels in some adverbs agree with vowels
in neighboring morphemes.