English
linebreeding
From line + breeding.
Proto-Germanic *līną ‘flax’
Proto-Germanic *līnǭ ‘line’
Proto-West Germanic *līnā ‘line’
Old English līne ‘line’
Middle English line ‘rope’
English line
Proto-Indo-European *bʰreh₁-
…
Proto-West Germanic *brōdijan
Old English brēdan ‘to bear offspring’
Middle English breden ‘to breed’
Middle English bredynge ‘gestation, incubation, propagation, hatching’
English breeding
Today it means
noun A form of inbreeding that may encompass crosses between individuals and their descendants or two cousins, used to increase a particular animal's contribution to the population.
Language periods are conventional ranges, not dates for this word.
Etymograph / linebreeding