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1. Informal a spin doctor
a. a ball that is bowled with a spinning motion
b. a bowler who specializes in bowling such balls
3. a streamlined fairing that fits over and revolves with the hub of an aircraft propeller
4. a fishing lure with a fin or wing that revolves when drawn through the water
5. an angler's name for the mature adult form (imago) of various flies, especially the mayflies
Automatically rotatable radar antenna, together with directly associated equipment.
Part of a mechanical scanner which rotates about an axis, generally restricted to cases where the speed of rotation is relatively high.
i. A streamlined housing, covering, hub, or boss of a propeller, fitted coaxially and rotating with the propeller. A spinner helps smoothen the airflow as it enters the cooling opening in the engine cowling.
ii. Something that spins, such as the arming vanes on certain bomb fuses or a rotating radar antenna.