from The Century Dictionary.
- noun In Peru, Bolivia, and Chile, pre-Columbian pottery or other Indian antiquities.
Sorry, no etymologies found.
It is said that the natives discovered its qualities by observing that a bird called the huaco, which feeds on snakes, whenever it was bitten flew off and ate some of this plant.
 In the religion of the Incas the idol (huaco) of the Moon was in charge of women, and when it was brought from the house of the Sun, to be worshipped, it was carried on their shoulders, because they said "it was a woman, and the figure resembled one."
Another is the juice of the creeping plant called vejuco de huaco
Saying this, he produced from his pocket some cake of the huaco leaves,
As for the other religious terms, 2 are Nahuatl: teocalli ` temple 'and teopan ` temple grounds'; 2 are Quechua: huaca or guaca ` an ancient Peruvian sacred object, such as a mountain, animal, shrine, or artifact, inhabited by a god or spirit 'and huaco or guaco ` a pre-Columbian relic of Peru,' as an object discovered in a tomb; and one is Mayan: cenote ` a natural well or sinkhole into which sacrificial offerings were thrown during ceremonies. '
"Courage, Senor, courage!" exclaimed the Indian; "I have some huaco cake with me.