百
ヒャク, ビャク, もも, お, ど, どう, なり, ひゃっ, ひゅく, も, もんど, ゆ

hundred

JLPT5 G1 S6 F163

一 (→ a number) + 白# (large number of acorns) → *one hundred* (i.e., a large number).

[Full Kanji Etymology List]