LATIN DICTIONARYLexicon Latīnum
adjectivefirst/second-declension adjective

pennus1

pennus (feminine penna, neuter pennum)
Classical[ˈpɛn.nʊs]Ecclesiastical[ˈpɛn.nus]

Meaning

  1. adjectivesharp, pointed

Declension

singular
formmasculinefeminineneuter
nominativepennuspennapennum
genitivepennīpennaepennī
dativepennōpennaepennō
accusativepennumpennampennum
ablativepennōpennāpennō
vocativepennepennapennum
plural
formmasculinefeminineneuter
nominativepennīpennaepenna
genitivepennōrumpennārumpennōrum
dativepennīspennīspennīs
accusativepennōspennāspenna
ablativepennīspennīspennīs
vocativepennīpennaepenna

pennus, a, um, adj. pinna,
I. pointed, sharp: pennum antiqui acutum dicebant: unde et avium pennae, quia acutae, Isid. Orig. 19, 19, 11 dub. (al. pinnum).

Origins

From penna.

proper noun · masculinesecond declension
Pennus2
Pennus m sg (genitive Pennī)
Classical[ˈpɛn.nʊs]Ecclesiastical[ˈpɛn.nus]

Meaning

  1. masculinesingularA Roman cognomen — famously held by
  2. masculinesingularMarcus Iunius Pennus, a Roman consul

Declension

declension
formsingularplural
nominativePennus—
genitivePennī—
dativePennō—
accusativePennum—
ablativePennō—
vocativePenne—

Pennus, i, m.,
I. a Roman surname: T. Quinctius Pennus, Liv. 4, 26.

Origins

From pennus (“pointed, sharp”).

In the Academy Smith's classical dictionaries

Quick answers

What does pennus mean in Latin?
pennus, a adjective, means “sharp, pointed”.
How do you pronounce pennus?
In classical Latin, [ˈpɛn.nʊs]; in ecclesiastical (church) Latin, [ˈpɛn.nus].