Definition of "gelatinous"

In certain star-fishes, small depressions in the layer of pigment which surrounds the nerve are filled, as described by the author just quoted, with transparent gelatinous matter, projecting with a convex surface, like the cornea in the higher animals.

1859 November 24, Charles Darwin, On the Origin of Species by Means of Natural Selection, […], London: John Murray, […]

Everyone listened, and everyone was listening still when It lumbered slobberingly into sight and gropingly squeezed Its gelatinous green immensity through the black doorway into the tainted outside air of that poison city of madness.

1928 February, H[oward] P[hillips] Lovecraft, “The Call of Cthulhu”, in Farnsworth Wright, editor, Weird Tales: A Magazine of the Bizarre and Unusual, volume 11, number 2, Indianapolis, Ind.: Popular Fiction Pub. Co., pages 159–178 and 287

Winston was gelatinous with fatigue. Gelatinous was the right word. It had come into his head spontaneously. His body seemed to have not only the weakness of a jelly, but its translucency.

1949 June 8, George Orwell [pseudonym; Eric Arthur Blair], chapter 9, in Nineteen Eighty-Four: A Novel, London: Secker & Warburg; republished [Australia]: Project Gutenberg of Australia, August 2001, part 2, page 165