"o-grade" meaning in English

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  "lang_code": "en",
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      "examples": [
        {
          "text": "Ancient Greek γόνος (gónos) is a reflex of *ǵónh₁os (“race”), which is itself an o-grade derivative of the root *ǵenh₁- (“to beget; to produce, bear”).",
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          "ref": "2006, Donald Ringe, From Proto-Indo-European to Proto-Germanic (A Linguistic History of English; 1), Oxford: Oxford University Press, →ISBN, page 12:",
          "text": "A considerable number of derived nominals, especially thematic nouns, also exhibited o-grade roots.",
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      "glosses": [
        "In Proto-Indo-European linguistics, an ablaut form of a Proto-Indo-European root, characterised by the presence of the */o/ vowel phoneme in place of */e/."
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          "ablaut",
          "ablaut"
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        "(Indo-European studies) In Proto-Indo-European linguistics, an ablaut form of a Proto-Indo-European root, characterised by the presence of the */o/ vowel phoneme in place of */e/."
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  "word": "o-grade"
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  "lang_code": "en",
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          "text": "Ancient Greek γόνος (gónos) is a reflex of *ǵónh₁os (“race”), which is itself an o-grade derivative of the root *ǵenh₁- (“to beget; to produce, bear”).",
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        "(Indo-European studies) In Proto-Indo-European linguistics, an ablaut form of a Proto-Indo-European root, characterised by the presence of the */o/ vowel phoneme in place of */e/."
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  "word": "o-grade"
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