Word

平均故障間隔

へいきんこしょうかんかく
mean time between failures; MTBF
Word

平均棍

へいきんこん
halter; haltere (small balancing organ on a two-winged fly)
Word

平行いとこ

平行従兄弟
へいこういとこ
parallel cousins; ortho-cousins
Word

平均気温

へいきんきおん
average temperature
Word

平山城

ひらやまじろ、ひらさんじょう
castle on a hill in the plains; flatland-mountain castle
Word

平積み

ひらづみ
flat display; stacking something flat (e.g. lying on its side, faceup)
Word

平静を保つ

へいせいをたもつ
to keep one's temper; to maintain one's composure; to remain calm; to keep presence of mind; to preserve one's equilibrium
Word

平場

ひらば
flat ground; seats immediately in front of the stage (e.g. in kabuki); multi-brand display area (in a shop)
Word

平城宮

へいじょうきゅう
Heijo Palace; Imperial palace in ancient Nara
Word

平将門の乱

たいらのまさかどのらん
Taira-no-Masakado Rebellion