testis
US /ˈtes.tɪs/
UK /ˈtes.tɪs/

1.
яичко, тестис
a male reproductive gland that produces spermatozoa and male hormones, usually situated in the scrotum in mammals
:
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The doctor examined the patient's testis.
Врач осмотрел яичко пациента.
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Each testis is responsible for producing sperm.
Каждое яичко отвечает за выработку сперматозоидов.