A critical area of performance for aircraft detection systems, defined by the distance at which the radar beam rises enough above the Earth's surface to make detection of a target at low level impossible.

plural of radar horizon

Pseudognaphalium californicum

plural of rabbit test

An early pregnancy test involving the injection of the tested woman's urine into a female rabbit, then examining the rabbit's ovaries a few days later for changes in response to a hormone.

(rail transport) A railway that uses a rack and pinion mechanism

Misspelling of rake in.

(euphemistic) Synonym of scientific racism

(euphemistic) cat meat

(euphemistic) cat meat