English-Thai Dictionary
tourmaline
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Webster's 1913 Dictionary
TOURMALINE
Tour "ma *line, n. Etym: [F. tourmaline, cf. It. turmalina, tormalina,NL. turmalina, turmalinus; all fr. tournamal, a name given to this stone in Ceylon. ] (Min. )
Defn: A mineral occurring usually in three-sided or six-sided prisms terminated by rhombohedral or scalenohedral planes. Black tourmaline (schorl ) is the most common variety, but there are also other varieties, as the blue (indicolite ), red (rubellite ), also green, brown, and white. The red and green varieties when transparent are valued as jewels. [Written also turmaline. ]
Note: Crystals of tourmaline when heated exhibit electric polarity (see Pyroelectric, n.). Tourmaline is also used in the form of a polariscope called tourmaline tongs.
New American Oxford Dictionary
tourmaline
tour ma line |ˈto͝ormələn, -ˌlēn ˈtʊrmələn | ▶noun a brittle gray or black mineral that occurs as prismatic crystals in granitic and other rocks. It consists of a boron aluminosilicate and has pyroelectric and polarizing properties, and is used in electrical and optical instruments and as a gemstone. ORIGIN mid 18th cent.: from French, based on Sinhalese tōramalli ‘carnelian. ’
Oxford Dictionary
tourmaline
tourmaline |ˈtʊəməlɪn, -liːn | ▶noun [ mass noun ] a brittle grey or black mineral which occurs as prismatic crystals in granitic and other rocks. It consists of a boron aluminosilicate and has pyroelectric and polarizing properties. ORIGIN mid 18th cent.: from French, based on Sinhalese tōramalli ‘carnelian ’.
French Dictionary
tourmaline
tourmaline n. f. nom féminin Pierre fine. Note Orthographique tourma l ine.
Sanseido Wisdom Dictionary
tourmaline
tour ma line /tʊ́ə r məlìːn /名詞 U C 〘鉱 〙トルマリン, 電気石 〘10月の誕生石; →birthstone 〙.
The Wordsmith Dictionary