The Collaborative International Dictionary of English v.0.48:

Phoca \Pho"ca\ (f[=o]"k[.a]), prop. n. [L., a seal, fr. Gr.
   fw`kh.] (Zool.)
   A genus of seals. It includes the common harbor seal and
   allied species. See Seal.
   [1913 Webster]

WordNet (r) 3.0 (2006):

Phoca
    n 1: type genus of the Phocidae: earless seals [syn: Phoca,
         genus Phoca]