Huitzilatl.

Headword: 
Huitzilatl.
Principal English Translation: 

a special spring and source of water relating to human sacrifice (see attestations)

Attestations from sources in English: 

The Huitzilatl was a special spring where water was obtained for bathing captive slaves nine days before they were to be sacrificed to the deities. This spring was between Coyoacan and Huitzilopochco.
Digital Florentine Codex, Book 2, Folio 83r, and Book 8, Folio 2r. https://florentinecodex.getty.edu/search?term=Huitzilatl&view=text&filters=