(colloquial, vulgar) a penis, a cock, a dick / (archaic) a short person

Alternative spelling of 水澄まし (“whirligig beetle”)

a surname

The hiragana syllable す (su). Its equivalent in katakana is ス (su). It is the thirteenth syllable in the gojūon order; its position is さ行う段 (sa-gyō u-dan, “row sa, section u”).