or Celeuma, in Antiquity, the shout or cry of the seamen, by which they animated each other in their work of rowing. The word is formed from ἵππος, to call, or give the signal.

Celeusma was also a kind of song or formula, rehearsed or played by the master or others, to direct the strokes and movements of the mariners, as well as to encourage them to labour.