plural of 45

(firearms) A standard kind of firearm designed to fire bullets that are approximately 0.45 inch in diameter.

plural of .45

Alternative form of Forty-five

A gramophone record played at 45 revolutions per minute. / (US politics, slang, uncountable) Donald Trump, as the forty-fifth president of the United States.

plural of 45

Synonym of Turner syndrome

Synonym of Turner syndrome

(physics) the only stable isotope of scandium, ⁴⁵₂₁Sc, having twenty-one protons and twenty-four neutrons

(physics) A radioactive isotope of calcium, ⁴⁵₂₀Ca, having twenty protons and twenty-five neutrons, and a half-life of 162.6 days; it is used as a tracer in studying calcium metabolism. As it decays it undergoes transformation (nuclear transmutation) via electron emission, also called negative beta decay (β−-decay), into scandium.