[roo-bid-ee-uh m-stron-shee-uh m, -shuh m, -tee-uh m] /ruˈbɪd i əmˈstrɒn ʃi əm, -ʃəm, -ti əm/
a radiometric dating method whereby the ratio of rubidium isotope to strontium in a mineral is used to calculate the age of the mineral, based on the rate of radioactive decay of rubidium to strontium.
a technique for determining the age of minerals based on the occurrence in natural rubidium of a fixed amount of the radioisotope 87Rb which decays to the stable strontium isotope 87Sr with a half-life of 4.7 × 1011 years. Measurement of the ratio of these isotopes thus gives the age of a mineral, for ages of up to about 4 × 109 years
verb (used with object), rued, ruing. 1. to feel sorrow over; repent of; regret bitterly: to rue the loss of opportunities. 2. to wish that (something) had never been done, taken place, etc.: I rue the day he was born. verb (used without object), rued, ruing. 3. to feel sorrow, repentance, or regret. noun 4. […]
Pharmacology, Trademark. 1. a brand of ibuprofen.
adjective 1. somewhat reddish; tinged with red; rufous. adjective 1. (botany) tinged with red or becoming red
noun 1. a neckpiece or collar of lace, lawn, or the like, gathered or drawn into deep, full, regular folds, worn in the 16th and 17th centuries. 2. something resembling such a piece in form or position. 3. a collar, or set of lengthened or specially marked hairs or feathers, on the neck of an […]