plural of signal box

A building, typically adjacent to or spanning a railway line, from where signals, points and (sometimes) level crossings are controlled. / The alarm-box of a police or fire-alarm system.

(biochemistry) A series of chemical reactions within a cell which start when a transmembrane protein comes into contact with a chemical signal, resulting in a second messenger being triggered.

(endocrinology) A type of cell signaling involving the release of a hormone from a nerve cell that has an effect on another cell.

plural of semaphore signal

(rail transport) Synonym of signal box

plural of signal cabin

Any signal sent by semaphore.

(rail transport, US) A structure built over railroad tracks on which signals are mounted. / (nautical) An open platform by the navigating bridge of a warship for the use of signalmen.

plural of signal bridge