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

(biology) A biochemical sequence in which one molecule that receives a signal activates another molecule

plural of signalling pathway

plural of semaphore signal

(rail transport, British spelling) A rail safety system installed in the driving cab of a train, which gives information to the train driver on track status and condition.

plural of danger-signal

plural of starting signal

plural of starter signal

plural of home signal

plural of cab signal