zygosity

noun
zy·gos·i·ty | \zī-ˈgä-sə-tē \

Definition of zygosity 

: the makeup or characteristics of a particular zygote also : the genetic relationship between offspring of a single birth especially in regard to being derived from the same or different zygotes

First Known Use of zygosity

1946, in the meaning defined above

History and Etymology for zygosity

probably from -zygous

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The first known use of zygosity was in 1946

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zygosity

noun
zy·gos·i·ty | \zī-ˈgäs-ət-ē \
plural zygosities

Medical Definition of zygosity 

: the makeup or characteristics of a particular zygote

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