Etymology of gas

The word gas is simply a phonetic transcription of the Greek word chaos [Gr: χάος]. It was first used in the early 17th century by the chemist J.B. Van Helmont.
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In modern Greek:
a) haos: chaos [Gr: χάος].
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WKP
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Etymology of aria

The word aria comes from the Italian aria, from the Latin aerem, accusative of aer (air), which is a transliteration of the Greek aer [air; Gr: αήρ]. See also etymolology of air here.
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In modern Greek:
a) aria: aria [Gr: άρια]
b) aeras: air [Gr: αέρας


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Etymology of unique

The word unique (single, solitary) comes from the French unique, from the Latin unicus (single, sole), from unus (one), from the Greek oenos (ace). See also "Etymology of one" here.

OED
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