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. See under Milling. -- Reversible process (Thermodynamics), any process consisting of a cycle of operations such that the different operations of the cycle can be performed in reverse order with a reversal of their effects.

A cycle for carrying four riders, so arranged that all the reders can assist in the propulsion.

A cycle having five crank shafts and adapted for five riders, all of whom can assist in the propulsion.

To pass in cycles; as, the centuries revolve.

To sit on, so as to be carried; as, to ride a horse; to ride a bicycle. [They] rend up both rocks and hills, and ride the air In whirlwind. Milton.

A bicycle or tricycle adapted for common roads rather than for the racing track.

nges or events ending where it began; a series of like events recurring in continuance; a cycle; a periodical revolution; as, the round of the seasons; a round of pleasures.

's feet to rest in, and fastened in place with a girth; also, a seat for the rider on a bicycle or tricycle.

A Chaldean astronomical period or cycle, the length of which has been variously estimated from 3,600 years to 3,600 days, or a little short of 10 years. Brande & C.

of expelling the exhaust gases from the cylinder by some special means, as, in many four-cycle engines, by utilizing the momentum of the exhaust gases in a long exhaust pipe.

ourse; to turn aside; to swerve; as, a ship sheers from her course; a horse sheers at a bicycle. To sheer off, to turn or move aside to a distance; to move away. -- To sheer up, to approach obliquely.

affected by its influence. They denominate some herbs solar, and some lunar. Bacon. Solar cycle. See under Cycle. -- Solar day. See Day, 2. -- Solar engine, an engine in which the energy of solar heat is used to produce motion, as in evaporating water for a steam engine, or expanding air for an air engine. -- Solar…

To move swifty; as, to spin along the road in a carriage, on a bicycle, etc. [Colloq.]

s asexual spores; -- opposed to gametophyte. It is not clearly differentiated in the life cycle of the lower plants. -- Spo`ro*phyt"ic (#), a.

e having two or more steam cylinders in the same axis, close to one another. -- Tandem bicycle or tricycle, one for two persons in which one rider sits before the other.

A tension spoke of a bicycle or similar wheel, secured tangentially to the hub.

Having three ports; specif.: Designating a type of two-cycle internal-combustion engine in which the mixture enters the crank case through a port uncovered by the piston near the end of its stroke.

Having two ports; specif.: Designating a type of two-cycle internal-combustion engine in which the admission of the mixture to the crank case is through a suction valve.

person or thing is, or may be, carried, as a coach, carriage, wagon, cart, car, sleigh, bicycle, etc.; a means of conveyance; specifically, a means of conveyance upon land.

ing their revolution. They are made in many forms, with two, three, or four wheels. See Bicycle, and Tricycle.