3 文書を見つけるための辞書。

• bed
• 地層
• (geology) a stratum of rock (especially sedimentary rock); "they found a bed of sandstone"
• 岩（特に堆積岩）の層

• bed, seam
• 層, 地層
• a stratum of ore or coal thick enough to be mined with profit; "he worked in the coal beds"
• 利益で採掘されるのに十分厚い鉱石または石炭の層

• stratum
• 層, 地層
• one of several parallel layers of material arranged one on top of another (such as a layer of tissue or cells in an organism or a layer of sedimentary rock)
• 1枚がもう1枚の上部に配置された物質の（例えば生物の組織、細胞の層または堆積岩の層）いくつかの平行な層の1枚