"au-" meaning in Latin

{
  "etymology_templates": [
    {
      "args": {
        "1": "la",
        "2": "ine-pro",
        "3": "*h₂ew"
      },
      "expansion": "Proto-Indo-European *h₂ew",
      "name": "inh"
    }
  ],
  "etymology_text": "Usually derived from Proto-Indo-European *h₂ew, and as such would be unrelated to its allomorph ab-; au- possibly took the place of ab- before f- to avoid confusion with ad-. Presumably, *ad and *ab would have both become af- before f-, given how sub- and ob- yielded suf- and of- in the same environment.\nThis has not deterred Bréal, Vine, De Vaan, Cser and DeLisi from continuing to attempt to derive au- from ab-. They do not provide an explanation for how sub- and ob- did not partake in a similar development.",
  "head_templates": [
    {
      "args": {
        "1": "la",
        "2": "prefix"
      },
      "expansion": "au-",
      "name": "head"
    }
  ],
  "lang": "Latin",
  "lang_code": "la",
  "pos": "prefix",
  "senses": [
    {
      "alt_of": [
        {
          "word": "ab- used before f-"
        }
      ],
      "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"
        }
      ],
      "examples": [
        {
          "text": "ab- + ferō → auferō",
          "type": "example"
        },
        {
          "text": "ab- + fugiō → aufugiō",
          "type": "example"
        }
      ],
      "glosses": [
        "Alternative form of ab- used before f-"
      ],
      "id": "en-au--la-prefix-OigeMO3L",
      "links": [
        [
          "ab-",
          "ab-#Latin"
        ]
      ],
      "tags": [
        "alt-of",
        "alternative",
        "morpheme"
      ]
    }
  ],
  "word": "au-"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "la",
        "2": "ine-pro",
        "3": "*h₂ew"
      },
      "expansion": "Proto-Indo-European *h₂ew",
      "name": "inh"
    }
  ],
  "etymology_text": "Usually derived from Proto-Indo-European *h₂ew, and as such would be unrelated to its allomorph ab-; au- possibly took the place of ab- before f- to avoid confusion with ad-. Presumably, *ad and *ab would have both become af- before f-, given how sub- and ob- yielded suf- and of- in the same environment.\nThis has not deterred Bréal, Vine, De Vaan, Cser and DeLisi from continuing to attempt to derive au- from ab-. They do not provide an explanation for how sub- and ob- did not partake in a similar development.",
  "head_templates": [
    {
      "args": {
        "1": "la",
        "2": "prefix"
      },
      "expansion": "au-",
      "name": "head"
    }
  ],
  "lang": "Latin",
  "lang_code": "la",
  "pos": "prefix",
  "senses": [
    {
      "alt_of": [
        {
          "word": "ab- used before f-"
        }
      ],
      "categories": [
        "Latin entries with incorrect language header",
        "Latin lemmas",
        "Latin prefixes",
        "Latin terms derived from Proto-Indo-European",
        "Latin terms inherited from Proto-Indo-European",
        "Pages with 2 entries",
        "Pages with entries"
      ],
      "examples": [
        {
          "text": "ab- + ferō → auferō",
          "type": "example"
        },
        {
          "text": "ab- + fugiō → aufugiō",
          "type": "example"
        }
      ],
      "glosses": [
        "Alternative form of ab- used before f-"
      ],
      "links": [
        [
          "ab-",
          "ab-#Latin"
        ]
      ],
      "tags": [
        "alt-of",
        "alternative",
        "morpheme"
      ]
    }
  ],
  "word": "au-"
}