"estr-" meaning in English

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  "etymology_text": "(pharmacology) From estrogen.",
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      "expansion": "estr-",
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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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          "word": "estro-"
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          "name": "Biology",
          "orig": "en:Biology",
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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",
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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"
      ],
      "topics": [
        "medicine",
        "pharmacology",
        "sciences"
      ]
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  "sounds": [
    {
      "ipa": "/ɛ.stɹ/"
    }
  ],
  "synonyms": [
    {
      "_dis1": "0 0",
      "tags": [
        "UK"
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      "word": "oestr-"
    },
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        "pharmacology",
        "medicine",
        "sciences"
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      "word": "-estr-"
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  ],
  "word": "estr-"
}

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    "English prefixes",
    "English terms with IPA pronunciation"
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  "etymology_text": "(pharmacology) From estrogen.",
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  "lang_code": "en",
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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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        "biology",
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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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      "ipa": "/ɛ.stɹ/"
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      "word": "-estr-"
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  "word": "estr-"
}