"ʔac-" meaning in Lushootseed

{
  "head_templates": [
    {
      "args": {
        "1": "lut",
        "2": "prefix"
      },
      "expansion": "ʔac-",
      "name": "head"
    }
  ],
  "lang": "Lushootseed",
  "lang_code": "lut",
  "pos": "prefix",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Lushootseed entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        }
      ],
      "derived": [
        {
          "word": "ʔacap"
        },
        {
          "word": "ʔacgʷiɬ"
        },
        {
          "word": "sʔacgʷəs"
        },
        {
          "word": "ʔacigʷəd"
        },
        {
          "word": "sʔacus"
        },
        {
          "word": "xʷʔəcusačiʔ"
        },
        {
          "word": "xʷʔəcušəd"
        }
      ],
      "glosses": [
        "denotes the center, typically of something round or enveloping (always bound to a lexical suffix)"
      ],
      "id": "en-ʔac--lut-prefix-qJCEDOPN",
      "tags": [
        "morpheme"
      ]
    }
  ],
  "word": "ʔac-"
}

{
  "derived": [
    {
      "word": "ʔacap"
    },
    {
      "word": "ʔacgʷiɬ"
    },
    {
      "word": "sʔacgʷəs"
    },
    {
      "word": "ʔacigʷəd"
    },
    {
      "word": "sʔacus"
    },
    {
      "word": "xʷʔəcusačiʔ"
    },
    {
      "word": "xʷʔəcušəd"
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "lut",
        "2": "prefix"
      },
      "expansion": "ʔac-",
      "name": "head"
    }
  ],
  "lang": "Lushootseed",
  "lang_code": "lut",
  "pos": "prefix",
  "senses": [
    {
      "categories": [
        "Lushootseed entries with incorrect language header",
        "Lushootseed lemmas",
        "Lushootseed prefixes",
        "Pages with 1 entry",
        "Pages with entries"
      ],
      "glosses": [
        "denotes the center, typically of something round or enveloping (always bound to a lexical suffix)"
      ],
      "tags": [
        "morpheme"
      ]
    }
  ],
  "word": "ʔac-"
}