ichor

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun Greek Mythology The rarefied fluid said to run in the veins of the gods.
• noun A watery, acrid discharge from a wound or ulcer.

from The Century Dictionary.

• noun In Greek and Roman mythology, an ethereal fluid believed to supply the place of blood in the veins of the gods.
• noun A thin, watery humor, like serum or whey; a thin, watery, acrid discharge from an ulcer, a wound, etc.

from the GNU version of the Collaborative International Dictionary of English.

• noun (Class. Myth.) An ethereal fluid that supplied the place of blood in the veins of the gods.
• noun A thin, acrid, watery discharge from an ulcer, wound, etc.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun the liquid that in Greek mythology was said to flow in place of blood in the veins of the gods
• noun poetic any bloodlike fluid
• noun a watery, fetid discharge from a sore
• noun yellow bile

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a fluid product of inflammation
• noun (Greek mythology) the rarified fluid said to flow in the veins of the Gods