تعريف zero-grade في الإنجليزية الإنجليزية القاموس.
In Proto-Indo-European linguistics, a term used to describe an ablaut form of a root characterized by the absence of the basic ablauting vowel phonemes */e/ and */o/
*bʰr̥- is the zero-grade of the Proto-Indo-European root *bʰer- meaning ‘to carry, bear’.