胄 (w)

(zhòu) helmet; descendants

胄子 (w)

(zhòuzǐ) eldest son

胄甲 (w)

(zhòujiǎ) helmet and armor

胄裔 (w)

(zhòuyì) distant progeny

胄裔繁衍 (w)

(zhòuyìfányǎn) Descendants are great in numbers. (idiom)