Толковый словарь английского языка - thallium
Thallium
thallium
noun Etymology: New Latin, from Greek thallos green shoot; from the bright green line in its spectrum Date: 1861 a soft poisonous metallic element that resembles lead in physical properties, occurs sparsely in a number of common ores, and is used chiefly in the form of compounds especially in photosensitive devices and formerly as a pesticide
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1.
n. Chem. a rare soft white metallic element, occurring naturally in zinc blende and some iron ores. Derivatives thallic adj. thallous adj. Etymology: formed as THALLUS, from the green line in its spectrum ...Толковый словарь английского языка Oxford English Reference
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