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]
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