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What is "gray comma"

The Collaborative International Dictionary
gray comma

Progne \Prog"ne\, n. [L., a swallow, traditionally said to be fr. Progne (The sister of Philomela), who was changed into a swallow, Gr. ?.] (Zo["o]l.)

  1. A swallow.

  2. A genus of swallows including the purple martin. See Martin.

  3. An American butterfly ( Polygonia Progne or Vanessa Progne). It is orange and black above, grayish beneath, with an L-shaped silver mark on the hind wings. Called also gray comma.