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A unit of force equal to the force which, acting for one second, will give a pound a velocity of one foot per second; -- proposed by J.D.Everett, an English physicist.

; a sulphide of bismuth, lead, and copper occuring in acicular crystals; -- called also aikinite. -- Needle shell (Zoöl.), a sea urchin. -- Needle spar (Min.), aragonite. -- Needle telegraph, a telegraph in which the signals are given by the deflections of a magnetic needle to the right or to the left of a certain p…