a rainshower in late summer, autumn, or winter / (by extension, figuratively) shedding tears / Short for 時雨煮 (shigureni), 時雨羹 (shigurekan), 時雨饅頭 (shigure manjū), etc.

(inorganic chemistry) Synonym of 酸化アルミニウム (sanka aruminiumu, “aluminium oxide”); alumina

a top secret, something confidential

槌骨: malleus