syn·ap·o·mor·phy | \ (ˌ)si-ˈna-pə-ˌmȯr-fē 
\
\ plural synapomorphies
Definition of synapomorphy
: a character or trait that is shared by two or more taxonomic groups and is derived through evolution from a common ancestral form
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Time Traveler for synapomorphy
The first known use of synapomorphy was in 1965
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