any of a large group of nitrogenous organic compounds that are essential constituents of living cells; consist of polymers of amino acids; essential in the diet of animals for growth and for repair of tissues; can be obtained from meat and eggs and milk and legumes; "a diet high in protein"
the act of assuming or maintaining a seated position; "he read the mystery at one sitting"
(photography) the act of assuming a certain position (as for a photograph or portrait); "he wanted his portrait painted but couldn't spare time for the sitting"
a session as of a legislature or court
not moving and therefore easy to attack; "a sitting target"
(genetics) a segment of DNA that is involved in producing a polypeptide chain; it can include regions preceding and following the coding DNA as well as introns between the exons; it is considered a unit of heredity; "genes were formerly called factors"
any of the more than 100 known substances (of which 92 occur naturally) that cannot be separated into simpler substances and that singly or in combination constitute all matter