tlalhuatl.

Headword: 
tlalhuatl.
Principal English Translation: 

tendon(s) (see Karttunen); or nerve (see attestations)

IPAspelling: 
tɬɑlwɑtɬ
Frances Karttunen: 

TLALHUA-TL inalienably possessed form: -TLALHUAYŌ tendon / nervio (M), su tendon (Z for possessed form) [(4)Tp.132,134,232, (2)Zp.121,161]. T also has TLALHUAYŌ-TL in absolutive form. Z has only possessed forms, once with –YŌ and once without.
Frances Karttunen, An Analytical Dictionary of Nahuatl (Norman: University of Oklahoma Press, 1992), 274.

Attestations from sources in Spanish: 

tlalhuatl = nervio
Gran Diccionario Náhuatl, citando a un documento, Bnf_362 del siglo XVIII, https://gdn.iib.unam.mx/diccionario/tlalhuatl/15617