"cestui" meaning in Old French

{
  "etymology_templates": [
    {
      "args": {
        "1": "fro",
        "2": "VL.",
        "3": "",
        "4": "*ecce istūi"
      },
      "expansion": "Vulgar Latin *ecce istūi",
      "name": "inh"
    },
    {
      "args": {
        "1": "VL.",
        "2": "*ecce iste"
      },
      "expansion": "*ecce iste",
      "name": "m"
    },
    {
      "args": {
        "1": "fro",
        "2": "la",
        "3": "ecce"
      },
      "expansion": "Latin ecce",
      "name": "der"
    },
    {
      "args": {
        "1": "la",
        "2": "istī"
      },
      "expansion": "istī",
      "name": "m"
    },
    {
      "args": {
        "1": "la",
        "2": "cui",
        "3": "",
        "4": "to whom"
      },
      "expansion": "cui (“to whom”)",
      "name": "m"
    },
    {
      "args": {
        "1": "ro",
        "2": "acestui"
      },
      "expansion": "Romanian acestui",
      "name": "cog"
    },
    {
      "args": {
        "1": "it",
        "2": "costui"
      },
      "expansion": "Italian costui",
      "name": "cog"
    }
  ],
  "etymology_text": "From Vulgar Latin *ecce istūi, (genitive-)dative masculine singular of *ecce iste, from Latin ecce + istī, influenced by cui (“to whom”). Compare Romanian acestui, Italian costui.",
  "head_templates": [
    {
      "args": {
        "1": "fro",
        "2": "pronoun",
        "cat2": "subject pronouns"
      },
      "expansion": "cestui",
      "name": "head"
    }
  ],
  "lang": "Old French",
  "lang_code": "fro",
  "pos": "pron",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Old French entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Old French pronouns",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Old French subject pronouns",
          "parents": [
            "Subject pronouns",
            "Pronouns",
            "Lemmas"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "the person in question"
      ],
      "id": "en-cestui-fro-pron-Yhm6mVWa",
      "links": [
        [
          "person",
          "person#English"
        ]
      ]
    }
  ],
  "word": "cestui"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "fro",
        "2": "VL.",
        "3": "",
        "4": "*ecce istūi"
      },
      "expansion": "Vulgar Latin *ecce istūi",
      "name": "inh"
    },
    {
      "args": {
        "1": "VL.",
        "2": "*ecce iste"
      },
      "expansion": "*ecce iste",
      "name": "m"
    },
    {
      "args": {
        "1": "fro",
        "2": "la",
        "3": "ecce"
      },
      "expansion": "Latin ecce",
      "name": "der"
    },
    {
      "args": {
        "1": "la",
        "2": "istī"
      },
      "expansion": "istī",
      "name": "m"
    },
    {
      "args": {
        "1": "la",
        "2": "cui",
        "3": "",
        "4": "to whom"
      },
      "expansion": "cui (“to whom”)",
      "name": "m"
    },
    {
      "args": {
        "1": "ro",
        "2": "acestui"
      },
      "expansion": "Romanian acestui",
      "name": "cog"
    },
    {
      "args": {
        "1": "it",
        "2": "costui"
      },
      "expansion": "Italian costui",
      "name": "cog"
    }
  ],
  "etymology_text": "From Vulgar Latin *ecce istūi, (genitive-)dative masculine singular of *ecce iste, from Latin ecce + istī, influenced by cui (“to whom”). Compare Romanian acestui, Italian costui.",
  "head_templates": [
    {
      "args": {
        "1": "fro",
        "2": "pronoun",
        "cat2": "subject pronouns"
      },
      "expansion": "cestui",
      "name": "head"
    }
  ],
  "lang": "Old French",
  "lang_code": "fro",
  "pos": "pron",
  "senses": [
    {
      "categories": [
        "Old French entries with incorrect language header",
        "Old French lemmas",
        "Old French pronouns",
        "Old French subject pronouns",
        "Old French terms derived from Latin",
        "Old French terms derived from Vulgar Latin",
        "Old French terms inherited from Vulgar Latin"
      ],
      "glosses": [
        "the person in question"
      ],
      "links": [
        [
          "person",
          "person#English"
        ]
      ]
    }
  ],
  "word": "cestui"
}