LATIN DICTIONARYLexicon Latīnum
proper noun · masculinesecond declension

Rēgillus1

Rēgillus m sg (genitive Rēgillī)
Classical[reːˈɡɪl.lʊs]Ecclesiastical[reˈd͡ʒil.lus]

Meaning

  1. A small lake in Latium famous for its battle
  2. A Roman cognomen — famously held by
  3. Lucius Aemilius Regillus, a Roman admiral

Declension

declension
formsingularplural
nominativeRēgillus—
genitiveRēgillī—
dativeRēgillō—
accusativeRēgillum—
ablativeRēgillō—
vocativeRēgille—

Rēgillus, i, m.
I. A town of the Sabines, whence Appius Claudius emigrated to Rome, Liv. 2, 16 Drak.; also called Rēgilli, ōrum, m., Suet. Tib. 1.— Hence, Rēgillānus, a, um, and Rēgillensis, e, adj., of or belonging to Regillus: Claudius Appius Regillanus, Suet. Tib. 2: Claudius Regillensis, Liv. 8, 15.—
II. A small lake in Latium (the mod. Cornufelle), celebrated for the victory over the Latins gained there by the Romans under the dictator Postumius, Cic. N. D. 3, 5, 11; called also lacus Regillus, Liv. 2, 19; Plin. 33, 2, 11, § 38; and Regilli lacus, Flor. 1, 11, 2; Aur. Vict. Vir. Ill. 16.— Hence, Rēgillensis, surname of the Postumii: M. Postumio Regillensi, Liv. 4, 49, 7: A. et L. Postumii Regillenses, id. 6, 22, 5.—
III. A Roman surname in the Æmilian gens, Cic. Att. 12, 24, 2: M. Aemilius Regillus, Liv. 24, 7 fin.; 8; 29, 11 fin.; 38.

Origins

Descendants
  • ItalianRegillo

In the Academy Smith's classical dictionaries

adjectivefirst/second-declension adjective
rēgī̆llus2
rēgī̆llus (feminine rēgī̆lla, neuter rēgī̆llum)
Classical[reːˈɡiːl.lʊs]Ecclesiastical[reˈd͡ʒil.lus]

Meaning

  1. adjectiveThe meaning of this term is uncertain. Possibilities include: royal, sumptuous, magnificent (seemingly used to name some specific type of garment)
    Quid erat induta? an regillam induculam an mendiculam?What was she wearing? The regal slip or the beggarly one?c. 190 BCE, Plautus, Epidicus 2.2.42
    regillae tunicae definitur purpura 2004 translation by Benedicte Nielsen116 BCE – 27 BCE, Marcus Terentius Varro, Menippeae 372.2

Declension

singular
formmasculinefeminineneuter
nominativerēgī̆llusrēgī̆llarēgī̆llum
genitiverēgī̆llīrēgī̆llaerēgī̆llī
dativerēgī̆llōrēgī̆llaerēgī̆llō
accusativerēgī̆llumrēgī̆llamrēgī̆llum
ablativerēgī̆llōrēgī̆llārēgī̆llō
vocativerēgī̆llerēgī̆llarēgī̆llum
plural
formmasculinefeminineneuter
nominativerēgī̆llīrēgī̆llaerēgī̆lla
genitiverēgī̆llōrumrēgī̆llārumrēgī̆llōrum
dativerēgī̆llīsrēgī̆llīsrēgī̆llīs
accusativerēgī̆llōsrēgī̆llāsrēgī̆lla
ablativerēgī̆llīsrēgī̆llīsrēgī̆llīs
vocativerēgī̆llīrēgī̆llaerēgī̆lla

rēgillus, a, um,
I. adj. dim. [regius], royal, regal, magnificent: inducula, Plaut. Ep. 2, 2, 39: tunica, Varr. ap. Non. 539, 10; cf. Fest. s. h. v. p. 286 Müll.

Origins

From regō or rēx. The form is consistent with a derivation from rēx (“king”) via rēgīna (“queen, female member of a royal household”) with contraction of -īn- + -lus to -īllus; compare ovīllus, suīllus, bovīllus. This derivation seems to fit the use in Plautus, which seems similar in sense to rēgius (“magnificent”), and Nonius supposes the word to be a diminutive of rēgius. However, this etymology does not clearly explain why the word was apparently used to refer to some specific garment. An alternative hypothesis holds that it originated primarily as a derivative of the verb regō, with any apparent connection to rēx being a secondary allusion or play on words. In this case, the form might represent a construction such as *rēgulus + -lus (compare rēgula), and the original sense is assumed to have been something like "woven vertically". Compare the use of rēctus in Pliny Natural History 8.194, "Ea prima texuit rectam tunicam, quales cum toga pura tironi induuntur novaeque nuptae." This etymology might be given by Festus, depending on how the passage is punctuated and interpreted. Radicke 2023 supports the derivation from regō along the lines of rēgula, but does not accept the explanation (based on Festus and Pliny) that this referred to weaving style, or the equation of the term with rēctus, or the assumption that this was ever a traditional type of Roman garment. Radicke instead assumes that the term regillam induculam used by Plautus represents a translation of Greek χιτὼν ὀρθοστάδιος (khitṑn orthostádios) (a long ungirded chiton that hung in a straight (ὀρθός (orthós)) line to the ground), and concludes that all subsequent appearances of regillus as a term for a garment in Latin texts (including in Varro) are based on a misunderstanding of the hapax in Plautus.

Quick answers

What does Rēgillus mean in Latin?
Rēgillus, a proper noun, means “A small lake in Latium famous for its battle; A Roman cognomen — famously held by”.
What is the genitive of Rēgillus?
The genitive singular is Rēgillī. Rēgillus is masculine, second declension.
How do you pronounce Rēgillus?
In classical Latin, [reːˈɡɪl.lʊs]; in ecclesiastical (church) Latin, [reˈd͡ʒil.lus].