WHEEL n.
k). -- Wheel tree (Bot.), a tree (Aspidosperma excelsum) of Guiana, which has a trunk so curiously fluted that a transverse section resembles the hub and spokes of a coarsely made wheel. See Paddlewood. -- Wheel urchin (Zoöl.), any sea urchin of the genus Rotula having a round, flat shell. -- Wheel window (Arch.), a…