Declan

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The Japanese word

is pronounced
osu | おす
means
male (animal)
Examples:
陰茎は雄の生殖器のひとつ。
inkei wa yū no seishoku ki no hitotsu.
The penis is one of the male reproductive organs.
雄のくじゃくは尾の羽毛が色彩豊かである。
yū no kujaku wa o no umō ga shikisai yutaka de aru.
The male peacock has colorful tail feathers.
犬は3匹いますが、1匹が雄であとは雌です。
inu wa san hiki i masu ga, ichi hiki ga yū de ato wa mesu desu.
I have three dogs; one is male and the others are female.
Examples sourced from tatoeba.org