Kyūjitai form of 中国地方: Chūgoku region

Clipping of 中折れ帽子 (nakaorebōshi, “fedora”) (felt hat)

a fedora (felt hat)

the Mesolithic

small mercy (from some misfortune); silver lining of a dark cloud; consolation in sadness; blessing in disguise

(mathematics) geometric mean, specifically, if the variables a, b, c satisfy the relation a:b=b:c, then b is the 幾何中項 of a and c.

a metatarsal bone

the Second Sino-Japanese War

Kyūjitai form of 営業中 (“open”)

If one learns without thinking, one will be lost in his learning. That is, if one does not think about what one learns, he will not arrive at the truth of it.