Definition of quaker

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