Category: R
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Ricinoleic acid
12-hydroxy-9-octadecanoic acid; an unsaturated hydroxy acid comprising about 80% of fatty acids in the glycerides of castor oil. It has a strong laxative action.
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Ricinine
A poisonous alkaloid present in the leaves and seeds of the castor bean plant, Ricinus communis.
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Ricin
A white, amorphous, highly toxic protein present in the seed of the castor bean, Ricinus communis. It has been used as a biological weapon.
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Ribonucleotide
A nucleotide in which the sugar ribose is combined with the purine or pyrimidine base.
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Riboflavin rib
A water-soluble vitamin of the B complex group. It is an orange-yellow crystalline powder. Symptoms of riboflavin deficiency are photophobia, cheilosis, glossitis, and seborrheic dermatitis, especially of the face and scalp.
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Rhytidosis
Wrinkling of the cornea, which occurs when tension in the eyeball is greatly diminished, particularly after the escape of aqueous or vitreous humor; usually a sign of impending death. A wrinkling, notably of the cornea, often seen as a sign of impending death.
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Rhythm method of birth control
A method preventing pregnancy that uses abstinence from sexual relations around the time of ovulation.
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Rhotacism
Overuse or improper utterance of “r” sounds.
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Rhopheocytosis
The mechanism by which ferritin is transferred from macrophages in the bone marrow to normoblasts.
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Rhomboideus
One of two muscles beneath the trapezius muscle.