Having the appearance or characteristics of a castle; also, in chess, describing a move where the king and rook exchange positions for protection.
From castle (noun), originally from Latin castellum (fortress, fortified town). The chess meaning emerged in the 15th century when the castling move was formalized in modern chess rules.
Castling in chess is one of the game's oldest special moves, and it's the only move where two pieces move at once—it evolved as the game changed, and different cultures initially played it differently!
Complete word intelligence in one call. Free tier — 50 lookups/day.