tzihuacmitl.

Headword: 
tzihuacmitl.
Principal English Translation: 

arrow whose shaft is made from the stalk of a variety of cactus or agave
Wimmer 2004, quoted in the Gran Diccionario Náhuatl, https://gdn.iib.unam.mx/diccionario/tzihuacmitl/75064

Attestations from sources in English: 

arrow spine(s) (late sixteenth century, Tetzcoco?)
Ballads of the Lords of New Spain: The Codex Romances de los Señores de la Nueva España, transcribed and translated by John Bierhorst (Austin: University of Texas Press, 2009), 32.

themes: 
Plants, Trees, Flora
Weapons, Shields, Heraldry