LATIN DICTIONARYLexicon Latīnum
noun · masculinesecond declension

arillus

arillus m (genitive arillī)
Classical[aˈrɪl.lʊs]Ecclesiastical[aˈril.lus]

Meaning

  1. Medieval Latinmasculinepip of a grape or pomegranate
  2. New Latinmasculinearil, a tissue surrounding a fruit-seed

Declension

declension
formsingularplural
nominativearillusarillī
arillae
genitivearillī
arillae		arillōrum
arillārum
dativearillō
arillae		arillīs
accusativearillum
arillam		arillōs
arillās
ablativearillōarillīs
vocativearillearillī
arillae

Origins

Probably a writing mistake for *acillus, a diminutive of acinus, acina (“pip of a grape or pomegranate”), and from herbaries and pharmacopoeiae introduced into botanical jargon.

Quick answers

What does arillus mean in Latin?
arillus, a noun, means “pip of a grape or pomegranate; aril, a tissue surrounding a fruit-seed”.
What is the genitive of arillus?
The genitive singular is arillī. arillus is masculine, second declension.
How do you pronounce arillus?
In classical Latin, [aˈrɪl.lʊs]; in ecclesiastical (church) Latin, [aˈril.lus].