caeruleus

Latin

Alternative forms

caerulus

Etymology

Dissimilation of *caeluleus, derived from caelum (“sky, heaven”) +‎ -uleus (diminutive suffix).^[1] However, in Classical Latin the word is attested as denoting the color of the rainy sky and that of deep water, and was on the whole associated with water.^[2]

Pronunciation

(Classical Latin) IPA^(key): [kae̯ˈrʊ.ɫe.ʊs]
(modern Italianate Ecclesiastical) IPA^(key): [t͡ʃeˈruː.le.us]

Adjective

caeruleus (feminine caerulea, neuter caeruleum); first/second-declension adjective

Deep water blue: the deep (blue) color associated with water and with the rainy sky^[2]
1. Dyed or colored blue
  1. (particularly) Colored with woad
2. Used as an epithet of sea and river deities or things connected with them
3. (of serpents) Glossy greenish-blue
4. (of persons) Blue-eyed
5. Dark-colored, dusky, gloomy
  1. (of clouds and shadows)
  2. (of things in or associated with the underworld)
6. (as a proper name) A spring and aqueduct at Rome
(rare) Of or connected with the sky, celestial

Usage notes

In spite of its etymology, in Classical Latin this word was typically connected to the deep (blue) color of moving water primarily and to the sky only secondarily, denoting a darkened sky that may rain. From there, it was also connected to darkness.

Declension

First/second-declension adjective.

	masculine	feminine	neuter	masculine	feminine	neuter
	singular			plural
nominative	caeruleus	caerulea	caeruleum	caeruleī	caeruleae	caerulea
genitive	caeruleī	caeruleae	caeruleī	caeruleōrum	caeruleārum	caeruleōrum
dative	caeruleō	caeruleae	caeruleō	caeruleīs
accusative	caeruleum	caeruleam	caeruleum	caeruleōs	caeruleās	caerulea
ablative	caeruleō	caeruleā	caeruleō	caeruleīs
vocative	caerulee	caerulea	caeruleum	caeruleī	caeruleae	caerulea

Derived terms

Descendants

→ English: cerulean
→ French: céruléen
→ Italian: ceruleo
→ Portuguese: cerúleo
→ Romanian: ceruleu
→ Spanish: cerúleo

Colors in Latin · colōrēs (layout · text)
albus, candidus, cānus, marmoreus (poetic), eburneus (poetic), niveus (poetic), argenteus (poetic), lacteus (poetic)	rāvus, pullus, mūrīnus (of livestock)	niger, āter, furvus, fuscus ("swarthy"), piceus (poetic)
ruber, russus, rūbidus (dark), flammeus (poetic); rutilus, pūniceus, spādīx (poetic), sanguineus (poetic)	rūfus, rutilus, rōbus (of oxen), croceus (poetic), aureus (poetic); fulvus (poetic), niger (of eyes), badius (of horses)	lūteus, flāvus ("blond"), lūridus, gilvus (of horses), helvus (of cattle); cēreus (poetic)
viridis, flāvus (poetic)	viridis, herbeus (of eyes), fulvus (poetic)	viridis, glaucus (poetic), caeruleus (poetic, only dark)
	glaucus (poetic), caeruleus, caesius (of eyes)	caeruleus, līvidus, ferrūgineus (poetic), glaucus (poetic)
violāceus	purpureus (underlying shade)	roseus

References

^ De Vaan, Michiel (2008), “caelum”, in Etymological Dictionary of Latin and the other Italic Languages (Leiden Indo-European Etymological Dictionary Series; 7), Leiden, Boston: Brill, →ISBN, pages 80-81
↑ ^2.0 ^2.1 Bradley, M. (2009). Colour and Meaning in Ancient Rome. (Cambridge Classical Studies).

“caeruleus” on page 278 of the Oxford Latin Dictionary (2nd ed., 2012)