zy·​gos·​i·​ty zī-ˈgä-sə-tē How to pronounce zygosity (audio)
: 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

Word History


probably from -zygous

First Known Use

1946, in the meaning defined above

Time Traveler
The first known use of zygosity was in 1946

Dictionary Entries Near zygosity

Cite this Entry

“Zygosity.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/zygosity. Accessed 20 Feb. 2024.

Medical Definition


zy·​gos·​i·​ty zī-ˈgäs-ət-ē How to pronounce zygosity (audio)
plural zygosities
: the makeup or characteristics of a particular zygote
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