Today's Word of the Day means...
radical (usually an alkyl or aryl group)
respiratory exchange ratio
or r roentgen
A circular object, form, or arrangement with a vacant circular center.
The area between two concentric circles; annulus.
A group of atoms linked by bonds that may be represented graphically in circular or triangular form.
Abbreviation of radius
The symbol for resistance.
Used as an ornament to decorate the fingers, arms, wrists, and also the ears and the nose. Rings were used as a signet (Gen. 38:18). They were given as a token of investment with authority (Gen. 41:42; Esther 3:8-10; 8:2), and of favour and dignity (Luke 15:22). They were generally worn by rich men (James 2:2). They are mentioned by Isiah (3:21) among the adornments of Hebrew women.
unit of X-radiation or gamma radiation, the amount that will produce, under normal conditions of pressure, temperature, and humidity, in 1 kg (2.2 lbs) of air, an amount of positive or negative ionization equal to 2.58104 coulomb. It is named for the German physicist Wilhelm Conrad Rontgen. See also rem.