Meaning

noun North American republic containing 50 states - 48 conterminous states in North America plus Alaska in northwest North America and the Hawaiian Islands in the Pacific Ocean; achieved independence in 17

noun a base containing nitrogen that is found in RNA (but not in DNA) and derived from pyrimidine; pairs with adenine

noun a heavy toxic silvery-white radioactive metallic element; occurs in many isotopes; used for nuclear fuels and nuclear weapons

originEtymology tree Proto-Indo-European *n̥smé Proto-Germanic *uns Old English ūs Middle English us English us From Middle English us, from Old English ūs (“us”, dative personal pronoun), from Proto-West Germanic *uns, from Proto-Germanic *uns (“us”), from Proto-Indo-European *n̥swé, alteration of *n̥smé (“us”). The compensatory lengthening was lost in Middle English due to the word being unstressed…

Etymology from Wiktionary, CC BY-SA 3.0