Webster's Revised Unabridged Dictionary · 1913

Thalia

Thalia , noun

[Latin, from Greek Qa`leia, originally, blooming, luxuriant, akin to qa`llein to be luxuriant.]

(a)
(Class. Mythology) That one of the nine Muses who presided over comedy.
(b)
(Class. Mythology) One of the three Graces.
(c)
(Class. Mythology) One of the Nereids.