山中: being in the mountains or woods

十三参り: A celebration for girls who have reached the age of thirteen.

The way to distinguish an olive flounder from a righteye flounder. 鮃(ひらめ) (hirame, “olive flounder”) can be distinguished from 鰈(かれい) (karei, “righteye flounder”) by noting that the eyes of the former are on the left and the eyes of the latter are on the right.

Saint-Vincent

São Vicente

sundress

alginic acid

triangular pyramid, tetrahedron

(historical) mathematics

三板, 舢板: sampan