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Adamant and similar words are used to refer to any especially hard substance, whether composed of diamond, some other gemstone, or some type of metal. Both ''adamant'' and ''diamond'' derive from the Greek word αδαμαστος (''adamastos''), meaning "untameable". ''Adamantite'' and ''adamantium'' (a metallic name derived from the Neo-Latin ending ''-ium'') are also common variants. Adamantine has, throughout ancient history, referred to anything that was made of a very hard material. Virgil describes Tartarus as having a screeching gate protected by columns of solid adamantine (Aeneid book VI). Later, by the Middle Ages, the term came to refer to diamond, as it was the hardest material then known, and remains the hardest non-synthetic material known. It was in the Middle Ages, too, that adamantine hardness and the lodestone's magnetic properties became confused and combined, leading to an alternate definition in which "adamant" means magnet, falsely derived from the Latin ''adamare'', which means to love or be attached to.〔(Webster's dictionary definition of ''adamant'' ), 1828 and 1913 editions〕 Another connection was the belief that adamant (the diamond definition) could block the effects of a magnet. This was addressed in chapter III of Pseudodoxia Epidemica, for instance. Since the word ''diamond'' is now used for the hardest gemstone, the increasingly archaic term "adamant" has a mostly poetic or figurative use. In that capacity, the name is frequently used in popular media and fiction to refer to a very hard substance. ==Adamant and Adamantine in mythology== * In Greek Mythology, Cronus castrated his father Uranus using an adamant sickle given to him by his mother Gaia. An adamantine sickle or sword was also used by the hero Perseus to decapitate the Gorgon Medusa while she slept. * In the Greek Tragedy, Prometheus Bound translated by G. M. Cookson, Hephaestus is to bind Prometheus "to the jagged rocks in adamantine bonds infrangible." * In John Milton's epic poem ''Paradise Lost'' adamant or adamantine is mentioned eight times. First in Book 1, Satan is hurled "to bottomless perdition, there to dwell in adamantine chains and penal fire"(lines 47-48). Three times in Book 2 the gates of hell are described as being made of adamantine (lines 436, 646 and 853). In Book 6, Satan "Came towring (), armd () in Adamant and Gold" (line 110), his shield is described as "of tenfold adamant" (line 255), and the armor worn by the fallen angels is described as "adamantine" (line 542). Finally in book 10 the metaphorical "Pinns () of Adamant and Chains" (lines 318-319) bind the world to Satan, and thus to sin and death〔John Milton, ''Paradise Lost'', Book one, two, six, and ten (1667). (see (text from Project Gutenberg ))〕 * In some versions of the Alexander Romance, Alexander the Great builds walls of Adamantine, the Gates of Alexander, to keep the giants Gog and Magog from pillaging the peaceful southern lands. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Adamant」の詳細全文を読む スポンサード リンク
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