(chemistry) Abbreviation of ethyl. (-C₂H₅)

plural of incurvature

(anatomy) relating to the radius and the capitellum

(physics) A naturally-occurring radioactive isotope of potassium, ⁴⁰₁₉K, having nineteen protons and twenty-one neutrons, and a half-life of 1.3 billion years; it is the chief source of natural rad...