elder sister (see Karttunen and Lockhart, below)
or
great-grandmother (Anderson and Dibble's translation of the Florentine Codex, Book 10, Folio 4v); the FC also gives tehueltiuh as a synonym of hueltiuhtli
"That's the Very One" (a personal name) James Lockhart (The Nahuas, 1992, 121) saw this personal name in the censuses of Culhuacan, c. 1580, and translated it in this way.