Quaker (n.) : One who quakes.
Quaker (n.) : 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.
Quaker (n.) : The nankeen bird.
Quaker (n.) : The sooty albatross.
Quaker (n.) : Any grasshopper or locust of the genus (Edipoda; -- so called from the quaking noise made during flight.