What do a.m. and p.m. stand for?

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
1905-10 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for pure line
  • Hybrids were also more responsive to changes in environment and were more stable than pure line entries.
  • These dogs are pretty similar, as you'd expect when crossing one pure line with another.
British Dictionary definitions for pure line

pure line

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
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