Syngeny is likely misspelled.
Syngeny has no English definition.
As a noun synandry is
characteristic of a synandrous flower, or a plant bearing such.
syngeny
Not English
Syngeny has no English definition. It may be misspelled.
synandry
English
Noun
(-)
(botany) Characteristic of a synandrous flower, or a plant bearing such.