Definition of "castalia" []

• A genus of bivalve mollusks, of the family Iridinidæ, confined to the fresh waters of South America. The best-known species is C. ambigua. The genus was founded by Lamarck in 1819. (noun)
• A genus of chætopodous annelids, of the family Hesionidæ. (noun)
• A genus of coleopterous insects. (noun)
• A genus of lepidopterous insects. (noun)
• (Salisbury, 1805.) In botany, see Nymphæa, 2. (noun)

The Century Dictionary (Public Domain)