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.

Example:
How should I introduce my Quaker and cockatiel?

Taxonomy
Quaker, Quaker Oats, Oats, Instant Oatmeal, Chewy, PepsiCo, Harvest, Granola, Granola Bars, Adobe Flash player, Quaker Oats Company, Recipes, Old Fashioned, Quaker Oatmeal, Quaker Chewy Granola Bars, Heart Health, Chewy Granola Bars, target.

Defination from the web:
Manufactures hot cereals, pancake mixes, grain-based snacks, value-added rice products, sports beverages, syrups and pasta products.