miller's thumb
/ˈmɪlərz ˌθʌm/
noun
- A small freshwater fish with a broad, flat head, also called a bullhead or sculpin.
- The miller's-thumb hides under rocks in fast-flowing rivers.
- Local fishermen call the small, flat-headed fish a miller's-thumb.
- We caught a miller's-thumb in the stream and released it back into the water.
Synonyms