The Acis reference article from the English Wikipedia on 24-Apr-2004
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Acis

Acis was, in Greek mythology, a Sicilian youth who was often considered the son of Dionysus. He loved the nymph Galatea but was killed with a boulder by a jealous suitor, the Cyclops Polyphemus. Galatea turned his blood into the river Acis in Sicily.

Ovid, Metamorphoses XIII, 750-68


Acis is also a 3D solid modeler from Spatial Corp. See ACIS.