Etymology of X-bar

Raw extraction fields are retained for auditing. Their order does not establish ancestry.

{
  "templates": [],
  "links": [
    [
      "overbar",
      "overbar"
    ],
    [
      "X̄",
      "X̄"
    ]
  ],
  "references": [],
  "descendants": [],
  "lexical": [
    {
      "pos": "noun",
      "glosses": [
        "A phrase, or, equivalently, a node in a syntax tree, which consists either of: (1) an adjunct and another X-bar phrase, (2) a head, X, and an optional complement, or (3) a conjunction sandwiched between two other X-bars. The X is a \"pro-letter\" which can be substituted by letters such as N for noun, V for verb, P for preposition, I for inflectional, etc."
      ],
      "tags": [],
      "recordId": "2fad2ffe4d03ef19786d065cf1fed47719b7554e81b62702868fa3c10f55850c",
      "rawRecordSha256": "90921a22bb927e333564b5d7cdd90bb62c4d78ae21cd9cbbd17976669b5f1604",
      "sourceRecordOrdinal": 3175934
    }
  ],
  "omittedAuxiliaryFields": {
    "templates": 0,
    "links": 0,
    "references": 0,
    "descendants": 0,
    "lexicalRecords": 0,
    "lexicalSenses": 0,
    "glosses": 0
  }
}