comma

1. The punctuation mark ⟨,⟩ used to indicate a set of parts of a sentence or between elements of a list.
2. A similar-looking subscript diacritical mark.
3. Any of various nymphalid butterflies of the genus Polygonia, having a comma-shaped white mark on the underwings, especially Polygonia c-album and Polygonia c-aureum of North Africa, Europe, and Asia.
4. A difference in the calculation of nearly identical intervals by different ways.
5. A delimiting marker between items in a genetic sequence.
6. In Ancient Greek rhetoric, a short clause, something less than a colon, originally denoted by comma marks. In antiquity it was defined as a combination of words having no more than eight syllables in all. It was later applied to longer phrases, e.g. the Johannine comma.
7. A brief interval. (figuratively)
8. A cloud shaped like a comma because of differential rotation of the cloud border and adjacent upward and downward vertical motions, often appearing in large and intense low-pressure systems.

Plural commas