sunglass
(archaic) A convex lens of glass for producing heat by converging the sun's rays into a focus.
One who visits; a guest; a visitor. / A spectre or ghost. / A migratory bird that makes a temporary stop somewhere.
(algebra) A method of constructing a Lie algebra from a Jordan algebra.
A Welsh unit of weight, equal to four Welsh pecks, or 168 pounds / (archaic) An old unit of volume (2+¹⁄₂ bushels, the volume of 168 pounds of wheat).
その老いた科学者は火口の上に集光用の凸レンズをかざし、太陽光を一点に集めて火花が飛び、着火させた。
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DiQt
Free
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