from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. The lamb eaten at Passover.
- n. Jesus Christ, symbolized as a sacrifice.
- n. A lamb depicted with nimbus and bearing a flag (usually St. George's cross: argent a cross gules).
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. figure of a lamb; emblematic of Christ
Sorry, no etymologies found.
 So in reference to the Paschal Lamb he says, "the mysterion therefore of the Lamb ... was a type of Christ."