Top Definition
A five-legged creature, enormous in size, closely resembling a spider, with the head of a goat. Last reported sighting was in 1776 off the west coast of madagascar, when the beast was seen floundering in the shallows, enjoying a relaxing swim through the coral gardens. It was promptly shot and burned, for being a bastard.
Yo, steve, i shot a Pentaglathon! it was a right bastard!
by sholto bonham-thomas February 26, 2004

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