An Etymological Dictionary of Astronomy and Astrophysics

1. A large lake or landlocked body of water.
   

2. A large area or great number of something. → Fermi sea.

Etymology (EN): O.E. sæ “sheet of water, sea, lake;” cf. Du. zee, Ger. See, O.N. sær “sea,” Goth saiws “marsh.”

Etymology (PE): Daryâ “sea;” Mid.Pers. daryâp variant zrah; O.Pers. drayah-; Av. zrayah- “sea;” cf. Skt. jráyas- “expanse, space, flat surface.”