eitheryoudaoicibaDictYouDict[either 词源字典]
either: [OE] Either is the modern descendant of an ancient Germanic phrase which meant literally ‘always each of two’. Its constituents were *aiwō, source of English aye ‘ever, always’, (which was also one of the building blocks of which each was made) and *gikhwatharaz, ancestor of English whether. In Old English this became lexicalized as the compound ǣgehwæther, subsequently contracted to ǣgther, from which developed modern English either. Despite its similarity, neither is more than just either with a negative prefix tacked on: its history is parallel but slightly different.
=> aye, whether[either etymology, either origin, 英语词源]
forgetyoudaoicibaDictYouDict
forget: [OE] From a formal point of view, forget is exactly what it seems – a combination of for and get. However, this is not the modern English preposition for, but a prefix that in former times was a live building block of the language, denoting negation or exclusion. So here, forget’s Germanic ancestor *fergetan meant literally ‘not get’, hence ‘lose one’s hold on’ and metaphorically ‘lose one’s memory of’.
=> get
atom (n.)youdaoicibaDictYouDict
late 15c., as a hypothetical indivisible body, the building block of the universe, from Latin atomus (especially in Lucretius) "indivisible particle," from Greek atomos "uncut, unhewn; indivisible," from a- "not" + tomos "a cutting," from temnein "to cut" (see tome). An ancient term of philosophical speculation (in Leucippus, Democritus), revived 1805 by British chemist John Dalton. In late classical and medieval use also a unit of time, 22,560 to the hour. Atom bomb is from 1945 as both a noun and a verb; compare atomic.
Deely-bobber (n.)youdaoicibaDictYouDict
"headband with springs carrying ornaments," 1982 trademark name held by Ace Novelty Company. Earlier it had been a patent name for a type of building blocks, manufactured 1969-1973.