Wiktionary:Word of the day/May 20

1. A building or other structure containing a (large) wheel, such as the water wheel of a mill.
   1. (automotive) The partially enclosed structure above and around a wheel of an automobile, typically partly formed by a portion of a fender panel that has been extended outward beyond the plane of the rest of the panel.
   2. (nautical) An enclosed compartment on the deck of a vessel such as a fishing boat, originally housing its helm or steering wheel, from which it may be navigated; on a larger vessel it is the bridge.
   3. (nautical) The enclosed structure around the paddlewheel of a steamboat.
2. (archaeology) A prehistoric structure from the Iron Age found in Scotland, characteristically including an outer wall within which a circle of stone piers (resembling the spokes of a wheel) form the basis for lintel arches supporting corbelled roofing with a hearth at the hub.
3. (Canada, US, baseball, by extension from sense 1.2) A pitch location which is favourable to the hitter.
4. (Canada, US, figuratively) A person's area of authority or expertise.

Today is European Maritime Day, which seeks to raise European citizens’ awareness of the seas and their importance.