枕木

(1)one of the cross braces that support the rails on a railway track; "the British call a railroad tie a sleeper"

(2)鉄道の軌道上でレールを支える交差形支柱の1本

(3)a fastener that serves to join or connect; "the walls are held together with metal links placed in the wet mortar during construction"

(4)繋いだり接合したりする止め具

(1)