The Collaborative International Dictionary of English v.0.48:

Thea \The"a\, prop. n. [NL. See Tea.] (Bot.)
   A genus of plants found in China and Japan; the tea plant.
   [1913 Webster]

   Note: It is now commonly referred to the genus Camellia.
         [1913 Webster]

WordNet (r) 3.0 (2006):

Thea
    n 1: (Greek mythology) the Titaness who was mother of Helios and
         Selene and Eos in ancient mythology [syn: Thea, Theia]