单词	backing hammer
释义	backing hammer noun : a hammer with a broad claw at one end of the head and a flat head at the other end used in shaping the backbones of books Word History First Known Use 1818, in the meaning defined above
随便看	semicylinder semicylinders perigean perigean tide perigee perigees periglacial perigloea periglottis perigon perigonal perigone perigones perigonia perigonial perigonium perigoniums perigons Perigordian perigynia perigynial perigynies perigynium perigynous perigyny

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