Science / Chemistry / Second: The second (s) is the base unit of time in the SI system of units, defined as the duration of 9,192,631,770 cycles of the radiation associated with a certain color of light emitted by the cesium atom.

Other Words for Second

Second Verb Synonyms: moment, instant, flash, minute, twinkling or wink or bat (of an eye), split second, sec, jiffy, two shakes (of a lamb's tail), tick, half a mo
Second Noun Synonyms: alternate, other
Second Adjective Synonyms: subsequent, following, next

Secondary Cell Wall

Science / Biology / Secondary Cell Wall: In woody plants, a second wall inside the primary cell wall; contains alternating layers of cellulose and lignin. MORE

Secondary (Lateral) Meristems

Science / Biology / Secondary (Lateral) Meristems: Plant meristems that produce secondary growth from a cambium. MORE

Ten-Second Line

Entertainment / Basketball / Ten-Second Line: The half-court line is the ten-second line. When a team is advancing the ball up the court from their defensive end, they have ten seconds to get the ball across the half-court line. MORE

Secondary Immunity

Science / Biology / Secondary Immunity: Resistance to an antigen the second time it appears. Because of the presence of B and T memory cells produced during the first exposure to the antigen, the second response is faster and more massive a MORE

Second Messenger

Science / Biology / Second Messenger: The mechanism by which nonsteroid hormones work on target cells. A hormone binds to receptors on the cells plasma membrane activating a molecule&emdash;the second messenger&emdash;that activates other MORE

Cubic Feet Per Second

Science / Geology / Cubic Feet Per Second: A unit of measure frequently used to quantify the rate of flow of a stream. It is equal to a volume of water one foot high and one foot wide moving a linear distance of one foot in one second. MORE