sea
sea
(sē) noun
Abbr. s., S.
1.
a. The continuous body of salt water covering most of the earth's surface, especially this body regarded as a geophysical entity distinct from earth and sky. b. A tract of water within an ocean. c. A relatively large body of salt water completely or partially enclosed by land. d. A relatively large landlocked body of fresh water.
2. The condition of the ocean's surface with regard to its course, flow, swell, or turbulence: a high sea.
3. Something that suggests the ocean in its overwhelming sweep or vastness: a sea of controversy.
4. Seafaring as a way of life.
5. Astronomy. A lunar mare.
noun
, attributive.
Often used to modify another noun: sea air; sea voyages.
idiom.
at sea
1.
On the sea, especially on a sea voyage.
2.
In a state of confusion or perplexity; at a loss.
[Middle English see, from Old English sǣ.]