"zero-grade" meaning in English

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  "etymology_text": "From zero + grade, as in gradation (“apophony”). Possibly after German Nullstufe.",
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      "form": "zero-grades",
      "tags": [
        "plural"
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        {
          "text": "bʰr̥- is the zero-grade of the Indo-European root *bʰer- meaning “to carry, bear”.",
          "type": "example"
        }
      ],
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        "In Proto-Indo-European linguistics, an ablaut form of a root characterized by the absence of the basic ablauting vowel phonemes */e/ and */o/."
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        {
          "word": "vanishing grade"
        },
        {
          "word": "zero grade"
        }
      ],
      "translations": [
        {
          "code": "da",
          "lang": "Danish",
          "sense": "Translations",
          "tags": [
            "neuter"
          ],
          "word": "nultrin"
        },
        {
          "code": "nl",
          "lang": "Dutch",
          "sense": "Translations",
          "tags": [
            "masculine"
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          "word": "nultrap"
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          "code": "de",
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          "sense": "Translations",
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            "feminine"
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          "word": "Schwundstufe"
        },
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          "code": "de",
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          "tags": [
            "feminine"
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          "word": "Nullstufe"
        }
      ]
    }
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  "word": "zero-grade"
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      "expansion": "zero + grade",
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  ],
  "etymology_text": "From zero + grade, as in gradation (“apophony”). Possibly after German Nullstufe.",
  "forms": [
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      "tags": [
        "plural"
      ]
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      ],
      "synonyms": [
        {
          "word": "vanishing grade"
        }
      ]
    }
  ],
  "synonyms": [
    {
      "word": "zero grade"
    }
  ],
  "translations": [
    {
      "code": "da",
      "lang": "Danish",
      "sense": "Translations",
      "tags": [
        "neuter"
      ],
      "word": "nultrin"
    },
    {
      "code": "nl",
      "lang": "Dutch",
      "sense": "Translations",
      "tags": [
        "masculine"
      ],
      "word": "nultrap"
    },
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      "tags": [
        "feminine"
      ],
      "word": "Schwundstufe"
    },
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      "code": "de",
      "lang": "German",
      "sense": "Translations",
      "tags": [
        "feminine"
      ],
      "word": "Nullstufe"
    }
  ],
  "word": "zero-grade"
}