What does spiōnia mean in Latin?

spiōnia, a noun, means “a variety of grapevine, resistant to wet conditions and distinguished by its large grapes”.

What is the genitive of spiōnia?

The genitive singular is spiōniae. spiōnia is feminine, first declension.

noun · femininefirst declension

spiōnia f (genitive spiōniae)

a variety of grapevine, resistant to wet conditions and distinguished by its large grapes
ut spionia dapsilis musto sed amplitudine magis uvarum quam numero fertilis[…] the spionia grape abundant in must but rich in the size rather than the number of its grapes4 CE – c. 70 CE, Columella, De re rustica 3.2.27

spĭŏnĭa, ae, f.,

I. a kind of grape-vine, Col. 3, 2, 27; 3, 7, 1; 3, 21, 3: vitis, Plin. 14, 2, 4, § 34.

Unknown etymology, perhaps a Mediterranean or Aegean word. Suggested connections include Welsh ffion (“purple foxglove”).