citrus: any of numerous fruits of the genus Citrus having thick rind and juicy pulp; grown in warm regions
fruit: the ripened reproductive body of a seed plant
metacenter: (shipbuilding) the point of intersection between two vertical lines, one line through the center of buoyancy of the hull of a ship in equilibrium and the other line through the center of buoyancy of the hull when the ship is inclined to one side; the distance of this intersection above the center of gravity is an indication of the stability of the ship