centimorgan

World English Dictionary
centimorgan (ˈsɛntɪˌmɔːɡən)
 
n
genetics a unit of chromosome length, used in genetic mapping, equal to the length of chromosome over which crossing over occurs with 1 per cent frequency
 
[C20: named after Thomas Hunt Morgan (1866--1945), US biologist]

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American Heritage
Medical Dictionary

centimorgan cen·ti·mor·gan (sěn'tə-môr'gən)
n.
Abbr. cM
A unit of crossover frequency in linkage maps of chromosomes equal to one hundredth of a morgan.

The American Heritage® Stedman's Medical Dictionary
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