Frá dictionary.com:
quaker
\Quak"er\, n. 1. One who quakes.
2. One of a religious sect founded by George Fox, of Leicestershire, England, about 1650, – the members of which call themselves Friends. They were called Quakers, originally, in derision. See Friend, n., 4.
Fox's teaching was primarily a preaching of repentance . . . The trembling among the listening crowd caused or confirmed the name of Quakers given to the body; men and women sometimes fell down and lay struggling as if for life. –Encyc. Brit.
3. (Zo["o]l.) (a) The nankeen bird. (b) The sooty albatross. © Any grasshopper or locust of the genus (Edipoda; – so called from the quaking noise made during flight.
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