(physics) The amount of fissile material needed to support a self-sustaining nuclear chain reaction. / (figuratively) The tipping point.

A map with a visual representation of roads used for automobile travel and navigation. A road map may contain other relevant data, such as terrain or railway lines.

Alternative spelling of frogmarch

Alternative spelling of frogmarch

(idiomatic, dated) Used in place of a real explanation when excusing oneself for a short period of time, particularly (euphemistic) to use the toilet or (historical) drink alcohol.

Alternative spelling of madman

A form of epilepsy where the seizures are characterized as severe and involve spasms and unconsciousness. A formal medical term would be tonic-clonic seizures.

A biscuit/cookie in the shape of a person and flavoured with ginger.

(neurology) A form of epilepsy where the seizures are characterized as minor, the person becomes vacant or unaware, but not involving spasms and unconsciousness. These seizures are usually brief, lasting up to 30 seconds, and may include twitching. A formal medical term would be absence seizures.

(biology) a diagram of an embryo of some organism showing the structures that will develop from each part