The Celestial Toyroom

celestial (adj.)

late 14c., "pertaining to the sky or the visible heavens; pertaining to the Christian or pagan heaven," from Old French celestial "celestial, heavenly, sky-blue," from Latin caelestis "heavenly, pertaining to the sky," from caelum "heaven, sky; abode of the gods; climate," which is of uncertain origin; perhaps from PIE *kaid-slo-, perhaps from a root also found in Germanic and Baltic meaning "bright, clear" (compare Lithuanian skaidrus "shining, clear;" Old English hador, German heiter "clear, shining, cloudless," Old Norse heið "clear sky").

The Latin word is the source of the usual word for "sky" in most of the Romance languages, such as French ciel, Spanish cielo, Italian cielo, Portuguese céu. Transferred sense of "heavenly, very delightful" in English is from early 15c. Celestial Empire "China" is from 1808, translating native names.

ceiling (n.)

mid-14c., celynge, "act of paneling a room," noun formed (with -ing) from Middle English verb ceil "put a cover or ceiling over," later "cover (walls) with wainscoting, panels, etc." (early 15c.); from Old French celer "to conceal," also "cover with paneling" (12c.), from Latin celare "to hide" (from PIE root *kel- (1) "to cover, conceal, save"). Probably influenced by Latin caelum "heaven, sky" (see celestial).

Extended to the paneling itself from late 14c., then to lath-and-plaster work.  The meaning "interior overhead surface of a room" is attested by 1530s; by late 19c. the meaning "wainscoting" was only in provincial English. Figurative sense "upper limit" is from 1934. Colloquial figurative phrase hit the ceiling "lose one's temper, get explosively angry" attested by 1908; earlier it meant "to fail" (by 1900, originally U.S. college slang). Glass ceiling in the figurative sense of "invisible barrier that prevents women from advancing" in management, etc., is attested from 1988.

Celeste 

fem. proper name, from French céleste (11c.) "sky, heaven," from Latin caelestis "heavenly" (see celestial).

cerulean

Selina

celestial (adj.)

of or relating to the sky;

celestial map

Synonyms: heavenly

celestial (adj.)

relating to or inhabiting a divine heaven;

celestial beings

Synonyms: heavenly

celestial (adj.)

of heaven or the spirit;

celestial peace

Synonyms: ethereal / supernal