"estr-" meaning in English

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  "lang": "English",
  "lang_code": "en",
  "pos": "prefix",
  "related": [
    {
      "_dis1": "0 0",
      "word": "-gestr-"
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  "senses": [
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      "alt_of": [
        {
          "word": "estro-"
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      "categories": [
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Biology",
          "orig": "en:Biology",
          "parents": [
            "Sciences",
            "All topics",
            "Fundamental"
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        "Alternative form of estro-."
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          "estro-",
          "estro-#English"
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        "(biology) Alternative form of estro-."
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        "biology",
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      ],
      "glosses": [
        "Used to form names of estrogens."
      ],
      "id": "en-estr--en-prefix-ipQUcYyB",
      "links": [
        [
          "pharmacology",
          "pharmacology"
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        [
          "estrogen",
          "estrogen#English"
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      ],
      "raw_glosses": [
        "(pharmacology) Used to form names of estrogens."
      ],
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        "morpheme"
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        "sciences"
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  "sounds": [
    {
      "ipa": "/ɛ.stɹ/"
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  "synonyms": [
    {
      "_dis1": "0 0",
      "tags": [
        "UK"
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      "word": "oestr-"
    },
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      "_dis1": "0 0",
      "topics": [
        "pharmacology",
        "medicine",
        "sciences"
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      "word": "-estr-"
    }
  ],
  "word": "estr-"
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    {
      "word": "-gestr-"
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  ],
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        "Alternative form of estro-."
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          "estro-",
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        "(biology) Alternative form of estro-."
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        "Used to form names of estrogens."
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        "(pharmacology) Used to form names of estrogens."
      ],
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        "sciences"
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  "word": "estr-"
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