Another form of amiant; a soft, fibrous mineral variety of asbestos.
Variant spelling of 'amiant', both deriving from the Greek 'amianthus.' The '-th' ending appears in some older English texts as an alternative transliteration from Greek.
This is a perfect example of how scientific terminology evolved unevenly—different scholars transliterated the Greek root differently, leaving us with multiple valid spellings that were used interchangeably for centuries before standardization.
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