"-θρον" meaning in Ancient Greek

{
  "etymology_templates": [
    {
      "args": {
        "1": "grc",
        "2": "grk-pro",
        "3": "*-tron ~ *-tʰron"
      },
      "expansion": "Proto-Hellenic *-tron ~ *-tʰron",
      "name": "inh"
    },
    {
      "args": {
        "1": "grc",
        "2": "ine-pro",
        "3": "*-trom ~ *-dʰrom"
      },
      "expansion": "Proto-Indo-European *-trom ~ *-dʰrom",
      "name": "inh"
    }
  ],
  "etymology_text": "From Proto-Hellenic *-tron ~ *-tʰron, from Proto-Indo-European *-trom ~ *-dʰrom.",
  "forms": [
    {
      "form": "-thron",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "grc",
        "2": "suffix"
      },
      "expansion": "-θρον • (-thron)",
      "name": "head"
    }
  ],
  "lang": "Ancient Greek",
  "lang_code": "grc",
  "pos": "suffix",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Ancient Greek entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "Denotes an instrument or means of doing something. A synonym of -τρον (-tron). Used, for example, in πτολίεθρον (ptolíethron, “city”), ἄρθρον (árthron, “joint”), βάθρον (báthron, “basis”), κλεῖθρον (kleîthron, “fastening”)."
      ],
      "id": "en--θρον-grc-suffix-zpmc4YCO",
      "links": [
        [
          "-τρον",
          "-τρον#Ancient Greek"
        ],
        [
          "πτολίεθρον",
          "πτολίεθρον#Ancient Greek"
        ],
        [
          "ἄρθρον",
          "ἄρθρον#Ancient Greek"
        ],
        [
          "βάθρον",
          "βάθρον#Ancient Greek"
        ],
        [
          "κλεῖθρον",
          "κλεῖθρον#Ancient Greek"
        ]
      ],
      "tags": [
        "morpheme"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/tʰron/"
    },
    {
      "ipa": "/θron/"
    },
    {
      "ipa": "/θron/"
    },
    {
      "ipa": "/tʰron/",
      "note": "5ᵗʰ BCE Attic"
    },
    {
      "ipa": "/tʰron/",
      "note": "1ˢᵗ CE Egyptian"
    },
    {
      "ipa": "/θron/",
      "note": "4ᵗʰ CE Koine"
    },
    {
      "ipa": "/θron/",
      "note": "10ᵗʰ CE Byzantine"
    },
    {
      "ipa": "/θron/",
      "note": "15ᵗʰ CE Constantinopolitan"
    }
  ],
  "word": "-θρον"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "grc",
        "2": "grk-pro",
        "3": "*-tron ~ *-tʰron"
      },
      "expansion": "Proto-Hellenic *-tron ~ *-tʰron",
      "name": "inh"
    },
    {
      "args": {
        "1": "grc",
        "2": "ine-pro",
        "3": "*-trom ~ *-dʰrom"
      },
      "expansion": "Proto-Indo-European *-trom ~ *-dʰrom",
      "name": "inh"
    }
  ],
  "etymology_text": "From Proto-Hellenic *-tron ~ *-tʰron, from Proto-Indo-European *-trom ~ *-dʰrom.",
  "forms": [
    {
      "form": "-thron",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "grc",
        "2": "suffix"
      },
      "expansion": "-θρον • (-thron)",
      "name": "head"
    }
  ],
  "lang": "Ancient Greek",
  "lang_code": "grc",
  "pos": "suffix",
  "senses": [
    {
      "categories": [
        "Ancient Greek 1-syllable words",
        "Ancient Greek entries with incorrect language header",
        "Ancient Greek lemmas",
        "Ancient Greek suffixes",
        "Ancient Greek terms derived from Proto-Hellenic",
        "Ancient Greek terms derived from Proto-Indo-European",
        "Ancient Greek terms inherited from Proto-Hellenic",
        "Ancient Greek terms inherited from Proto-Indo-European",
        "Ancient Greek terms with IPA pronunciation"
      ],
      "glosses": [
        "Denotes an instrument or means of doing something. A synonym of -τρον (-tron). Used, for example, in πτολίεθρον (ptolíethron, “city”), ἄρθρον (árthron, “joint”), βάθρον (báthron, “basis”), κλεῖθρον (kleîthron, “fastening”)."
      ],
      "links": [
        [
          "-τρον",
          "-τρον#Ancient Greek"
        ],
        [
          "πτολίεθρον",
          "πτολίεθρον#Ancient Greek"
        ],
        [
          "ἄρθρον",
          "ἄρθρον#Ancient Greek"
        ],
        [
          "βάθρον",
          "βάθρον#Ancient Greek"
        ],
        [
          "κλεῖθρον",
          "κλεῖθρον#Ancient Greek"
        ]
      ],
      "tags": [
        "morpheme"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/tʰron/"
    },
    {
      "ipa": "/θron/"
    },
    {
      "ipa": "/θron/"
    },
    {
      "ipa": "/tʰron/",
      "note": "5ᵗʰ BCE Attic"
    },
    {
      "ipa": "/tʰron/",
      "note": "1ˢᵗ CE Egyptian"
    },
    {
      "ipa": "/θron/",
      "note": "4ᵗʰ CE Koine"
    },
    {
      "ipa": "/θron/",
      "note": "10ᵗʰ CE Byzantine"
    },
    {
      "ipa": "/θron/",
      "note": "15ᵗʰ CE Constantinopolitan"
    }
  ],
  "word": "-θρον"
}