"tertial" meaning in English

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "la",
        "3": "tertius",
        "t": "third"
      },
      "expansion": "Latin tertius (“third”)",
      "name": "bor"
    }
  ],
  "etymology_text": "From Latin tertius (“third”); the tertial feathers are the third row of feathers.",
  "forms": [
    {
      "form": "tertials",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "tertial (plural tertials)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
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          "source": "w"
        },
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          "parents": [],
          "source": "w"
        },
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          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Ornithology",
          "orig": "en:Ornithology",
          "parents": [
            "Zoology",
            "Biology",
            "Sciences",
            "All topics",
            "Fundamental"
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          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Three",
          "orig": "en:Three",
          "parents": [
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            "All topics",
            "Terms by semantic function",
            "Fundamental"
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          "source": "w"
        }
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      "examples": [
        {
          "ref": "1923, Arthur Cleveland Bent, Life Histories of North American Birds: Wild Fowl, page 76:",
          "text": "He continues — \"There was the same rear up, with the head bent down, followed by an upjerk of the hind parts; the long sickle-shaped tertials, so noticeable in this species, seemed little if at all expanded, […]",
          "type": "quote"
        }
      ],
      "glosses": [
        "Any flight feather attached to the humerus (upper arm) of a bird."
      ],
      "id": "en-tertial-en-noun-FXJk~IxN",
      "links": [
        [
          "ornithology",
          "ornithology"
        ],
        [
          "flight feather",
          "flight feather"
        ],
        [
          "humerus",
          "humerus"
        ]
      ],
      "raw_glosses": [
        "(ornithology) Any flight feather attached to the humerus (upper arm) of a bird."
      ],
      "related": [
        {
          "word": "tertian"
        },
        {
          "word": "tertiary"
        }
      ],
      "topics": [
        "biology",
        "natural-sciences",
        "ornithology"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/ˈtɝʃl̩/",
      "tags": [
        "General-American"
      ]
    },
    {
      "ipa": "/ˈtɜːʃl̩/",
      "tags": [
        "Received-Pronunciation"
      ]
    },
    {
      "rhymes": "-ɜː(ɹ)ʃəl"
    }
  ],
  "word": "tertial"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "la",
        "3": "tertius",
        "t": "third"
      },
      "expansion": "Latin tertius (“third”)",
      "name": "bor"
    }
  ],
  "etymology_text": "From Latin tertius (“third”); the tertial feathers are the third row of feathers.",
  "forms": [
    {
      "form": "tertials",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "tertial (plural tertials)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "related": [
    {
      "word": "tertian"
    },
    {
      "word": "tertiary"
    }
  ],
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English nouns",
        "English terms borrowed from Latin",
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        "English terms with quotations",
        "Pages with 1 entry",
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        "Quotation templates to be cleaned",
        "Rhymes:English/ɜː(ɹ)ʃəl",
        "Rhymes:English/ɜː(ɹ)ʃəl/2 syllables",
        "en:Ornithology",
        "en:Three"
      ],
      "examples": [
        {
          "ref": "1923, Arthur Cleveland Bent, Life Histories of North American Birds: Wild Fowl, page 76:",
          "text": "He continues — \"There was the same rear up, with the head bent down, followed by an upjerk of the hind parts; the long sickle-shaped tertials, so noticeable in this species, seemed little if at all expanded, […]",
          "type": "quote"
        }
      ],
      "glosses": [
        "Any flight feather attached to the humerus (upper arm) of a bird."
      ],
      "links": [
        [
          "ornithology",
          "ornithology"
        ],
        [
          "flight feather",
          "flight feather"
        ],
        [
          "humerus",
          "humerus"
        ]
      ],
      "raw_glosses": [
        "(ornithology) Any flight feather attached to the humerus (upper arm) of a bird."
      ],
      "topics": [
        "biology",
        "natural-sciences",
        "ornithology"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/ˈtɝʃl̩/",
      "tags": [
        "General-American"
      ]
    },
    {
      "ipa": "/ˈtɜːʃl̩/",
      "tags": [
        "Received-Pronunciation"
      ]
    },
    {
      "rhymes": "-ɜː(ɹ)ʃəl"
    }
  ],
  "word": "tertial"
}