Boyd’s Bible Dictionary:
The Hebrews so designated any large body of water, whether lake, river, sea, or ocean
(Gen. 1:10; Deut. 30:13; Job 14:11; Isa. 19:5; Jer. 51:36; Ezek. 32:2). (1) “Molten sea” was the immense brass layer of Solomon’s temple (1 Kings 7:23-26). (2) “Sea of the Plain” (Deut. 4:49). [SALT SEA.] (3) “Great Sea” (Josh. 15:47), “uttermost sea” (Deut. 11:24), the Mediterranean, between Europe and Africa. (4) “Sea of Tiberias” [GENNESARET.] (5) “Sea of Merom” [MEROM.]
Concise Bible Dictionary:
This is used as a symbol of the mass of the people unorganized (Rev. 13:1). In Revelation 13:11 a beast arises out of the earth, pointing to organization.
Strong’s Dictionary of Greek Words:
Transliteration:
thalassa
Meaning:
probably prolonged from 251; the sea (genitive case or specially)