Webster's Revised Unabridged Dictionary · 1913

Carol

Carol , noun

[Old French carole a kind of dance wherein many dance together, from caroler to dance; perh. from Celtic; compare Armor. koroll, n., korolla, korolli, v., Ir. car music, turn, circular motion, also Latin choraula a flute player, charus a dance, chorus, choir.]

1.
A round dance. [Obsolete] — Chaucer
2.
A song of joy, exultation, or mirth; a lay.
The costly feast, the carol, and the dance. — Dryden
It was the carol of a bird. — Byron
3.
A song of praise of devotion; as, a Christmas or Easter carol.
Heard a carol, mournful, holy. — Tennyson
In the darkness sing your carol of high praise. — Keble
4.
Joyful music, as of a song.
I heard the bells on Christmans Day Their old, familiar carol play. — Longfellow

Carol , transitive verb

1.
To praise or celebrate in song.
The Shepherds at their festivals Carol her goodness. — Milton
2.
To sing, especially with joyful notes.
Hovering swans... carol sounds harmonious. — Prior

Carol , intransitive verb

To sing; esp. to sing joyfully; to warble.
And carol of love's high praise. — Spenser
The gray linnets carol from the hill. — Beattie

Carol , noun

[Old French carole a sort of circular space, or carol.]

(Architecture) A small closet or inclosure built against a window on the inner side, to sit in for study. The word was used as late as the 16th century. The term carrel, of the same has largely superseded its use.
A bay window may thus be called a carol. — Parker

Also: Carrol