1. Noun

   insect; bug; cricket; moth

   彼女は虫が大嫌いだ。

2. worm; roundworm

3. thing inside one's body believed to influence one's thoughts and feelings; (one's) unconscious

   from a traditional belief of an internal insectsee 虫を殺す

4. nervousness; fretfulness

   see 虫気

5. person devoted to one thing; single-minded person

   see 本の虫

6. valve core

7. mushi (type of game played with a stripped deck)

   HanafudaUsually written using kana alonesee 虫札

Also written 蟲【むし】mushi