Also read somakaku. Timber that is made square by hewing and shaving with a hatchet *ono 斧, or an adze *chōna 釿, or a broad ax *masakari 鉞. There are three sizes: ōgaku 大角 (30 cm square or greater), chūgaku 中角 (18-30 cm square), and kogaku 小角 (6-12 cm square).