(UK) Alternative form of on second thought

As good as the best, as in quality or reputation; inferior to no one else or to nothing else of the same kind.

(slang, sometimes capitalized) Heroin.

(cinematography) A separate team that shoots footage that is of secondary importance for the final cut of the motion picture, as opposed to first unit.

Alternative spelling of second half

Somebody ranking next below a commander. / Someone ranking next below the person in charge.

belonging to the second string of a team / substitute or replacement / second most important

(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

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