What does polygonos mean in Latin?

polygonos, a noun, means “knotgrass”.

What is the genitive of polygonos?

The genitive singular is polygonī. polygonos is masculine, second declension.

noun · masculinesecond declension

polygonos m (genitive polygonī)

pŏlўgŏnos or -us, i, f., or pŏlў-gŏnon, i (pŏlўgŏnĭum, ĭi, Scrib. Comp. 193), n., = πολύγονος or -ον,

I. a plant (called in pure Lat. herba sanguinalis or sanguinaria), knotgrass, Plin. 27, 12, 91, § 113; 26, 15, 90, § 158.