"Rha" meaning in Latin

{
  "etymology_templates": [
    {
      "args": {
        "1": "la",
        "2": "grc",
        "3": "Ῥᾶ"
      },
      "expansion": "Ancient Greek Ῥᾶ (Rhâ)",
      "name": "bor"
    }
  ],
  "etymology_text": "Borrowed from Ancient Greek Ῥᾶ (Rhâ).",
  "head_templates": [
    {
      "args": {
        "1": "Rha",
        "g": "m",
        "indecl": "1"
      },
      "expansion": "Rha m (indeclinable)",
      "name": "la-proper noun"
    }
  ],
  "lang": "Latin",
  "lang_code": "la",
  "pos": "name",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Latin entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 2 entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "place",
          "langcode": "la",
          "name": "Rivers",
          "orig": "la:Rivers",
          "parents": [
            "Bodies of water",
            "Places",
            "Landforms",
            "Water",
            "Names",
            "Earth",
            "Liquids",
            "All topics",
            "Proper nouns",
            "Terms by semantic function",
            "Nature",
            "Matter",
            "Fundamental",
            "Nouns",
            "Chemistry",
            "Lemmas",
            "Sciences"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "A river in Sarmatia, now the Volga"
      ],
      "id": "en-Rha-la-name-i0VGxc9f",
      "links": [
        [
          "Sarmatia",
          "Sarmatia#English"
        ],
        [
          "Volga",
          "Volga"
        ]
      ],
      "tags": [
        "indeclinable",
        "masculine"
      ]
    }
  ],
  "word": "Rha"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "la",
        "2": "grc",
        "3": "Ῥᾶ"
      },
      "expansion": "Ancient Greek Ῥᾶ (Rhâ)",
      "name": "bor"
    }
  ],
  "etymology_text": "Borrowed from Ancient Greek Ῥᾶ (Rhâ).",
  "head_templates": [
    {
      "args": {
        "1": "Rha",
        "g": "m",
        "indecl": "1"
      },
      "expansion": "Rha m (indeclinable)",
      "name": "la-proper noun"
    }
  ],
  "lang": "Latin",
  "lang_code": "la",
  "pos": "name",
  "senses": [
    {
      "categories": [
        "Latin entries with incorrect language header",
        "Latin indeclinable nouns",
        "Latin lemmas",
        "Latin masculine indeclinable nouns",
        "Latin masculine nouns",
        "Latin proper nouns",
        "Latin terms borrowed from Ancient Greek",
        "Latin terms derived from Ancient Greek",
        "Pages with 2 entries",
        "Pages with entries",
        "la:Rivers"
      ],
      "glosses": [
        "A river in Sarmatia, now the Volga"
      ],
      "links": [
        [
          "Sarmatia",
          "Sarmatia#English"
        ],
        [
          "Volga",
          "Volga"
        ]
      ],
      "tags": [
        "indeclinable",
        "masculine"
      ]
    }
  ],
  "word": "Rha"
}