LATIN DICTIONARYLexicon Latīnum
noun · neuterthird declension

nāpy

nāpy n (genitive nāpyos)
Classical[ˈnaː.py]Ecclesiastical[ˈnaː.pi]

Meaning

  1. mustard, mustard seed
    Semen optimum Aegyptium. Athenienses napy appellaverunt, alii thaspi, alii saurion.77 CE – 79 CE, Plinius Maior, Naturalis Historia 19.171.5
    Alterum thlaspi aliqui Persicon nap vocant, latis foliis, radicibus magnis, et ipsum utile ischiadicorum infusioni.77 CE – 79 CE, Plinius Maior, Naturalis Historia 27.140.1

nāpy, ўŏs, n., = νᾶπυ (an old form for σίναπι),
I. mustard: sinapi Athenienses napy appellaverunt, Plin. 19, 8, 54, § 171: alterum thlaspi aliqui Persicum napy appellaverunt, id. 27, 13, 113, § 140.

Origins

Borrowed from Ancient Greek νᾶπυ (nâpu) (for the variants, compare also σίναπι (sínapi) and νᾱ́πειον (nā́peion)).

Quick answers

What does nāpy mean in Latin?
nāpy, a noun, means “mustard, mustard seed”.
What is the genitive of nāpy?
The genitive singular is nāpyos. nāpy is neuter, third declension.
How do you pronounce nāpy?
In classical Latin, [ˈnaː.py]; in ecclesiastical (church) Latin, [ˈnaː.pi].