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|1.||(Bot.) A tropical tree (Hernandia sonora), which bears a drupe that rattles when dry in the inflated calyx.|
|2.||A child's toy, consisting of a box, out of which, when the lid is raised, a figure (usually a clown) springs; also called jack-in-the-box.|
|3.||(Mech.) An epicyclic train of bevel gears for transmitting rotary motion to two parts in such a manner that their relative rotation may be variable; applied to driving the wheels of tricycles, road locomotives, and to cotton machinery, etc.; an equation box; a jack frame; - called also compensating gearing.|
|4.||A large wooden screw turning in a nut attached to the crosspiece of a rude press.|
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.