PROTACTINIUM

protactinium, protoactinium, Pa, atomic number

(noun) a short-lived radioactive metallic element formed from uranium and disintegrating into actinium and then into lead

Source: WordNet® 3.1

protactinium (uncountable)

A chemical element (symbol Pa) with atomic number 91: a dense, silvery-gray actinide metal.

• protoactinium (dated)

Source: Wiktionary

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12 February 2025

(noun) an abnormal enlargement of the colon; can be congenital (as in Hirschsprung’s disease) or acquired (as when children refuse to defecate)

Coffee Trivia

The New York Stock Exchange started out as a coffee house.