English word endoskeletal comes from English skeletal, English endo-

Detailed word origin of endoskeletal

Dictionary entry	Language	Definition
skeletal	English (eng)	Haggard, cadaverous, emaciated or gaunt. Of, or relating to the skeleton.
endo-	English (eng)
endoskeletal	English (eng)	(anatomy) Of or pertaining to an internal skeleton, usually of bone (an endoskeleton).

Words with the same origin as endoskeletal