plural of galactic habitable zone

(astrobiology, astronomy) the zone in a disk galaxy lying within the disk which is neither too far from the core so as to be lacking in heavier elements, nor too close to the core as to experience excessive exposures to supernovae, where intelligent life may develop

(US, slang) To cause great disgust or nausea.

(organic chemistry) A chemical reaction that transforms primary alkyl halides into primary amines, traditionally by means of potassium phthalimide.

A rule that limits or forbids the consideration or discussion of a particular topic by members of a legislative or decision-making body.

plural of gag rule

(US) Alternative form of McLeod gauge

(of a law) that prevents undercover or unauthorized investigations at agricultural facilities

an ag-gag law

Abbreviation of group-specific antigen.