ecauhyotl.

Headword: 
ecauhyotl.
Principal English Translation: 

shadow, shade (see Karttunen)

Orthographic Variants: 
ehcauhyōtl
IPAspelling: 
ehkɑwyoːtɬ
Alonso de Molina: 

ecauhyotl. sombra.
Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 28r. col. 1. Thanks to Joe Campbell for providing the transcription.

Frances Karttunen: 

EHCAUHYŌ-TL shadow, shade / sombra (M) [(2)Bf.2v,5v,(2)Cf.19r]. See EHCAUHTILIĀ.
Frances Karttunen, An Analytical Dictionary of Nahuatl (Norman: University of Oklahoma Press, 1992), 75.

Lockhart’s Nahuatl as Written: 

shadow, shade; first element may be related to ehēcatl; contains -yōtl.
James Lockhart, Nahuatl as Written: Lessons in Older Written Nahuatl, with Copious Examples and Texts (Stanford: Stanford University Press and UCLA Latin American Studies, 2001), 217.