n shiny substance that resemble enamel and is secreted by the corium of certain fishes (especially ganoid fishes) and composes the outer layer of their scales
n the convergence of two parallel railroad tracks in a narrow place; the inner rails cross and run parallel and then diverge so a train remains on its own tracks at all times
n a form of punishment in which a person is forced to run between two lines of men facing each other and armed with clubs or whips to beat the victim
n a framework of steel bars raised on side supports to bridge over or around something; can display railway signals above several tracks or can support a traveling crane etc.
n an independent nonpartisan federal agency that acts as the investigative arm of Congress making the executive branch accountable to Congress and the government accountable to citizens of the United States
n a correctional institution used to detain persons who are in the lawful custody of the government (either accused persons awaiting trial or convicted persons serving a sentence)