(Isogenic line.) One line in a series of genetically similar plant lines that carry different specific genes for resistance to a particular pathogen. Found on http://ppathw3.cals.cornell.edu/glossary/Defs_I.htm
A line joining points of equal value. Examples of these include height contours on a map or isobars showing atmospheric pressure on a weather map.
Found on http://www.encyclo.co.uk/local/20195