1. A punctuation mark (',') used to indicate the separation of elements within the grammatical structure of a sentence
   "The Oxford comma is the comma used before 'and' in a list of three or more items"
    
2. Anglewing butterfly with a comma-shaped mark on the underside of each hind wing
   "The comma butterfly's distinctive marking was visible when it folded its wings"; "The Polygonia comma butterfly's distinctive marking was visible when it folded its wings";
   - comma butterfly, Polygonia comma

Derived forms: commas

Type of: brush-footed butterfly, four-footed butterfly, nymphalid, nymphalid butterfly, punctuation, punctuation mark [Brit]

Part of: genus Polygonia, Polygonia

Encyclopedia: Comma