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From The Collaborative International Dictionary of English v.0.48:
Poundal \Pound"al\, n. [From 5th Pound.] (Physics & Mech.) A unit of force based upon the pound, foot, and second, being the force which, acting on a pound avoirdupois for one second, causes it to acquire by the of that time a velocity of one foot per second. It is about equal to the weight of half an ounce, and is 13,825 dynes. [1913 Webster]