The Collaborative International Dictionary of English v.0.48:
Seascape \Sea"scape\, n. [Cf. Landscape.] A picture representing a scene at sea. Compare landscape. --Thackeray. [1913 Webster]WordNet (r) 3.0 (2006):
seascape n 1: a view of the sea 2: a painting of the sea (as distinguished from a landscape) [syn: seascape, waterscape]