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庇面 (ひめん, himen) Japanese meaning: dome | Kotomora

庇ひ面めん

Meanings

1

In mineralogy, a dome is a crystal form consisting of two faces that intersect a symmetry plane. This is a technical term.

この結けっ晶しょうには庇ひ面めんが観かん察さつされる。
A dome is observed on this crystal.

Kanji

庇protect, shield, defend
面mask, face, features

Etymology

The term is composed of 庇 (ひ, 'eaves' or 'overhang') and 面 (めん, 'face' or 'surface'), likely describing the shape of the crystal form. The exact historical derivation is uncertain.