【上位】 an instrumentality invented for a particular purpose; "the device is small enough to wear on your wrist"; "a device intended to conserve water" 特定の目的のために発明された道具。
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【下位】 lighter consisting of a thin piece of wood or cardboard tipped with combustible chemical; ignites with friction; "he always carries matches to light his pipe"; "as long you've a lucifer to light your fag" 1片の薄い木切れあるいは燃焼性の化学薬品が先端に付けられたボール紙から成るライター。摩擦で発火する。
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【上位】 a substance that can be consumed to produce energy; "more fuel is needed during the winter months"; "they developed alternative fuels for aircraft" エネルギーを生み出すために消費される物質。
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