"preanesthetized" meaning in English

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          "text": "All the animals were preanesthetized with azaperone (Stresnil, Jansen Pharmaceutica N.V., Belgium, 4 mg/kg of body weight, i.m.)",
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        "simple past and past participle of preanesthetize"
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          "text": "All the animals were preanesthetized with azaperone (Stresnil, Jansen Pharmaceutica N.V., Belgium, 4 mg/kg of body weight, i.m.)",
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