a ceramic jug or pitcher; later, a gourd bowl (see attestations and see the IDIEZ entry for tecomitl)
The translation of this term, which exists in modern Eastern Huastecan Nahuatl as a reference to a gourd cup, seems to refer in early texts to a ceramic jug. See glyphs for names starting with or containing Tecon in the Matrícula de Huexotzinco (MH), such as on folio 736 recto. Tecontontli, which is a small jug, would support tecomitl as a full sized jug, removing the diminutive.
See also these glyphs in the MH that seem to contain the element -tecon-, all of them showing a ceramic jug or pitcher:
Tecon (MH736r), https://aztecglyphs.wired-humanities.org/content/tecon-mh736r
Zoquitecon (MH658v), https://aztecglyphs.wired-humanities.org/content/zoquitecon-mh658v
Iztatecon (MH736r), https://aztecglyphs.wired-humanities.org/content/iztatecon-mh736r
(Stephanie Wood)