What is the meaning of そ?
The hiragana syllable そ (so). Its equivalent in katakana is ソ (so). It is the fifteenth syllable in the gojūon order; its position is さ行お段 (sa-gyō o-dan, “row sa, section o”).
粗:
疎:
十: ten
衣: clothing
背: back
麻: hemp
磯: rocky beach
阻:
俎:
祖: ancestor
疽:
租:
素:
粗:
疏:
疎:
酥, 蘇:
其, 夫:
楚:
Source: wiktionary.org