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seatmate a person sharing the same seat or seating row, as on a passenger plane or train.
seat-of-the-pants (informal) of the act of operating an aircraft, done without the guidance of instruments. [2 definitions]
seatrain a ship for transporting a train or railroad cars across a body of water.
sea turtle any of the species of large marine turtles with paddle-shaped limbs, such as loggerheads and leatherbacks, found in warm-water seas.
sea urchin a soft-bodied echinoderm that is enclosed in a hard round or disk-shaped shell, covered with long thin movable spines.
sea wall a wall or embankment strong enough to withstand the force of waves, built esp. to protect a shore from erosion.
seaward to or toward the sea. [4 definitions]
seawater water from the sea.
seaway a route for ocean-going ships, esp. a well-established one; sea-lane. [3 definitions]
seaweed any of a wide variety of algae that grow in water, esp. salt water. [3 definitions]
seaworthy of a ship, capable of being safely used on the sea.
sebaceous of, concerning, similar to, or composed of fat. [2 definitions]
sebum the semiliquid fatty secretion of the sebaceous glands.
SEC abbreviation of "Securities and Exchange Commission."
sec1 of wines, not sweet; dry.
sec2 (informal) a second, or very short time.
sec. abbreviation of "secretary." [2 definitions]
secant a line or line segment that intersects a curve at two or more points. [4 definitions]
secco a painting done on dry plaster, or the technique of such painting.
secede to quit an organization, a political or religious unit or alliance, or the like.
secession the action or an instance of seceding. [2 definitions]