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origin of a word or phrase; etymology
Do you know the origin of this word?
mysterious / occultness
The color of that entrance is mysterious, creating a mystical atmosphere.
language, speech
He can speak many languages.
origin, derivation, genesis
What is the origin of this word?
linguistics
He is majoring in linguistics.
(chemistry) rare earth elements
Rare earth elements are essential materials for the manufacture of electronic devices.
(physics, chemistry) atomic number
The atomic number of helium is 2.
an isotope
An isotope refers to elements with the same atomic number but different numbers of neutrons.
(chemistry) element, chemical element
Hydrogen is the most abundant element in the universe.
a transition element
Transition elements play an important role in chemical reactions.
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