Hedgehog

1. n. A form of dredging machine.
2. n. A small European insectivore (Erinaceus Europaeus), and other allied species of Asia and Africa, having the hair on the upper part of its body mixed with prickles or spines. It is able to roll itself into a ball so as to present the spines outwardly in every direction. It is nocturnal in its habits, feeding chiefly upon insects.
3. n. The Canadian porcupine.
4. n. A species of Medicago (M. intertexta), the pods of which are armed with short spines; — popularly so called.

The word meanings were obtained from OPTED(The Online Plain Text English Dictionary), which is based on “The Project Gutenberg Etext of Webster’s Unabridged Dictionary” which is in turn based on the 1913 US Webster’s Unabridged Dictionary (See Project Gutenburg), as a text file.