• zero grade

Fromzero +‎grade, as ingradation(“apophony”). Possibly afterGermanNullstufe.

zero-grade (pluralzero-grades)

1. (Indo-European linguistics) InProto-Indo-European linguistics, anablaut form of a root characterized by the absence of the basic ablauting vowelphonemes */e/ and */o/.

   Synonym:(dated)vanishing grade

   Coordinate terms:e-grade /full-grade,o-grade,lengthened grade

   *bʰr̥- is thezero-grade of the Indo-European root*bʰer- meaning “to carry, bear”.

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