'Threadfin' definitions:
Definition of 'threadfin'
From: WordNet
noun
Mullet-like tropical marine fishes having pectoral fins with long threadlike rays
Definition of 'Threadfin'
From: GCIDE
- Threadfin \Thread"fin`\, n. (Zool.) Any one of several species of fishes belonging to Polynemus and allied genera. They have numerous long pectoral filaments. [1913 Webster]