arsenic

Etymology

From Middle English arsenik, borrowed from Middle French arsenic, from Latin arsenicum, from Ancient Greek ἀρσενικόν (arsenikón, “yellow arsenic”) (influenced by ἀρσενικός (arsenikós, “potent, virile”)), from Semitic (compare Classical Syriac ܙܪܢܝܟܐ (zarnīḵā), Aramaic 𐡆𐡓𐡍𐡉𐡊𐡀 (zrnykʾ /⁠zarnīḵā⁠/)), from Middle Iranian *zarnīk (compare Persian زرنی (zarni, “arsenic”)), from Old Iranian *zarniya-ka- (compare Avestan 𐬰𐬀𐬭𐬀𐬥𐬌𐬌𐬀 (zaraniia, “golden”), Old Persian 𐎭𐎼𐎴𐎡𐎹 (d-r-n-i-y /⁠daraniya-⁠/, “gold”), Sanskrit हिरण्य (híraṇya, “gold”), Persian زر (zar, “gold”)), ultimately from Proto-Indo-European *ǵʰelh₃-. More at yellow.

noun

1. A nonmetallic chemical element (symbol As) with an atomic number of 33.
2. (countable) A single atom of this element.
3. Arsenic trioxide.

adj

1. (chemistry) Of or containing arsenic with a valence of 5.