(physics) The emission of electrons from the surface of a solid when bombarded with electrons or other charged particles

(physics) A wave of fluctuating temperature or entropy propagated in the superfluid phase of liquid helium

(biochemistry) Any substance used to transmit a signal within a cell, especially one which triggers a cascade of events by activating cellular components

(informal) conversation overheard from someone talking on a mobile phone

The upper joint of the leg of a fowl, especially when used as food

(physics) Newton's observation that the rate of change of the momentum of a body is directly proportional to, and in the same direction as, the net force acting on it.

In Australian Aboriginal culture, restricted to initiated men, or to women; not public knowledge.

plural of second cousin

plural of parallax second

(scholarly studies) A written commentary which discusses previously produced original work of another author, especially a notable author.