traffic circle
n.
A circular one-way road at a junction of thoroughfares, facilitating an uninterrupted flow of traffic. Also called regionally rotary.
1731, from M.L. rotarius "pertaining to wheels," from L. rota "wheel," from PIE base *roto- "to run, to turn, to roll" (cf. Skt. rathah "car, chariot;" Avestan ratho; Lith. ratas "wheel," ritu "I roll;" O.H.G. rad, Ger. Rad, Du. rad, O.Fris. reth, O.S. rath, O.Ir. roth, Welsh rhod "carriage wheel"). The international service club (founded by Paul P. Harris in Chicago in 1905) so called from the practice of clubs entertaining in rotation. Hence Rotarian (1911).
Pump\, n. [Akin to D. pomp, G. pumpe, F. pompe; of unknown origin.] An hydraulic machine, variously constructed, for raising or transferring fluids, consisting essentially of a moving piece or piston working in a hollow cylinder or other cavity, with valves properly placed for admitting or retaining the fluid as it is drawn or driven through them by the action of the piston. Note: for various kinds of pumps, see Air pump, Chain pump, and Force pump; also, under Lifting, Plunger, Rotary, etc. Circulating pump (Steam Engine), a pump for driving the condensing water through the casing, or tubes, of a surface condenser. Pump brake. See Pump handle, below. Pump dale. See Dale. Pump gear, the apparatus belonging to a pump. --Totten. Pump handle, the lever, worked by hand, by which motion is given to the bucket of a pump. Pump hood, a semicylindrical appendage covering the upper wheel of a chain pump. Pump rod, the rod to which the bucket of a pump is fastened, and which is attached to the brake or handle; the piston rod. Pump room, a place or room at a mineral spring where the waters are drawn and drunk. [Eng.] Pump spear. Same as Pump rod, above. Pump stock, the stationary part, body, or barrel of a pump. Pump well. (Naut.) See Well.
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