LATIN DICTIONARYLexicon Latīnum
adjectivefirst/second-declension adjective

rubidus1

rubidus (feminine rubida, neuter rubidum)
Classical[ˈrʊ.bɪ.dʊs]Ecclesiastical[ˈruː.bi.dus]

Meaning

  1. adjectivered in color, appearing red

Declension

singular
formmasculinefeminineneuter
nominativerubidusrubidarubidum
genitiverubidīrubidaerubidī
dativerubidōrubidaerubidō
accusativerubidumrubidamrubidum
ablativerubidōrubidārubidō
vocativerubiderubidarubidum
plural
formmasculinefeminineneuter
nominativerubidīrubidaerubida
genitiverubidōrumrubidārumrubidōrum
dativerubidīsrubidīsrubidīs
accusativerubidōsrubidāsrubida
ablativerubidīsrubidīsrubidīs
vocativerubidīrubidaerubida

rŭbĭdus, a, um, adj. id.,
I. red, reddish, dark-red (rare), cf. Gell. 2, 26, 8 sq.; 14: ampulla, Plaut. Stich. 1, 3, 77: panis, id. Cas 2, 5, 2; cf. Fest. pp. 262 and 263 Müll.: facies ex vinolentiā, Suet. Vit. 17.

Origins

From rubeō and -idus. Appears to have a different meaning from rūbidus. Attested since the 1st century AD alongside the proliferation of derived color terms with -idus.

adjectivefirst/second-declension adjective
rūbidus2
rūbidus (feminine rūbida, neuter rūbidum)
Classical[ˈruː.bɪ.dʊs]Ecclesiastical[ˈruː.bi.dus]

Meaning

  1. adjectivedark red
    robiginosam strigilem, ampullam rubidamc. 200 BCE, Plautus, Stichus 230 (iambic senarius)
    "Rubidus" autem est rufus atrior et nigrore multo inustusHowever, "rubidus" is a darker red and burned with much blackness.c. 177 CE, Aulus Gellius, Noctes Atticae 2.26.14
  2. adjectivered-brown (or) twice-baked (or) partially baked
    Una edepol opera in furnum calidum condito Atque ibi torreto me pro pane rubido,c. 180 BCE, Plautus, Casina 2.5.1–3 (iambic senarius)

Declension

singular
formmasculinefeminineneuter
nominativerūbidusrūbidarūbidum
genitiverūbidīrūbidaerūbidī
dativerūbidōrūbidaerūbidō
accusativerūbidumrūbidamrūbidum
ablativerūbidōrūbidārūbidō
vocativerūbiderūbidarūbidum
plural
formmasculinefeminineneuter
nominativerūbidīrūbidaerūbida
genitiverūbidōrumrūbidārumrūbidōrum
dativerūbidīsrūbidīsrūbidīs
accusativerūbidōsrūbidāsrūbida
ablativerūbidīsrūbidīsrūbidīs
vocativerūbidīrūbidaerūbida

Origins

From Proto-Indo-European *h₁rewdʰ- (“red”) + -idus. The different ablaut grade from rubeō suggests that the adjective is not directly derived from the stative verb. Probably most closely related to rōbus and rōbīgō.

Quick answers

What does rubidus mean in Latin?
rubidus, a adjective, means “red in color, appearing red”.
How do you pronounce rubidus?
In classical Latin, [ˈrʊ.bɪ.dʊs]; in ecclesiastical (church) Latin, [ˈruː.bi.dus].