Source : Webster's Revised Unabridged Dictionary (1913)

Doris \Do"ris\, n. [L. Doris, the daughter of Oceanus, and wife
   of Nereus, Gr. ?.] (Zo["o]l.)
   A genus of nudibranchiate mollusks having a wreath of
   branchi[ae] on the back.

Source : WordNet®

Doris
     n : (Greek mythology) wife of Nereus and mother of the Nereids