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”)

(obsolete) round the clock / (obsolete) all the time