(pharmacology) A drug C₁₄H₂₂N₂O₂ that increases acetylcholine levels by inhibiting the action of cholinesterase and is used to treat dementia associated with Alzheimer's disease and Parkinson's disease.

Having a relationship of rivalry. / (economics, of a good) Which can be consumed by no more than one person at the same time.

Third-person singular simple present indicative form of rivalise

Alternative form of rivalize

(pharmacology) An anticoagulant drug C₁₉H₁₈ClN₃O₅S (trademark Xarelto) that inhibits the activity of factor X and is taken orally especially to prevent and treat deep vein thrombosis and pulmonary embolism and to reduce the risk of stroke related to atrial fibrillation.

(mineralogy) A monoclinic-prismatic mineral containing boron, hydrogen, magnesium, oxygen, and sodium.

plural of rivaless

(obsolete) A female rival.

Alternative form of archrival

plural of arch-rival