pure line

noun Genetics.

a uniform strain of organisms that is relatively pure genetically because of continued inbreeding and artificial selection.

Origin of pure line

First recorded in 1905–10

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for pure line

Historical Examples of pure line

Thus, it is not difficult to breed to practically a pure-line condition.
The Tomato
Paul Work

British Dictionary definitions for pure line

pure line

noun

a breed or strain of animals or plants in which certain characters appear in successive generations as a result of inbreeding or self-fertilization

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012