Dictionary.net

• A long flat worm like a tape, bred in the intestines of vertebrate animals.

1874 - Etymological and pronouncing dictionary of the English language
By Stormonth, James, Phelp, P. H.

• n. A broad, flat, many jointed worm, often many feet in length, found in the intestines of man and other vertebrate animals.

1871 - The Cabinet Dictionary of the English Language