2 definitions
for Endoskeleton
From The Collaborative International Dictionary of English v.0.48 :
Endoskeleton \En`do*skel"e*ton\, n. [Endo- + skeleton.] (Anat.)
The bony, cartilaginous, or other internal framework of an
animal, as distinguished from the exoskeleton.
[1913 Webster]
From WordNet (r) 2.0 :
endoskeleton
n : the internal skeleton; bony and cartilaginous structure
(especially of vertebrates)