hard rime (English spelling) hardrime

...It can be thought of as the same way that hail is formed. (3) Hard rime It is formed by the collision of supercooled cloud particles, just like frost-covered trees, but it is semi-transparent or nearly transparent, hard ice, and often forms when the temperature is close to 0°C. Hard ice is similar to the way that hail is formed. When the temperature is higher than the conditions for hard ice formation and drizzle or raindrops adhere to it, it does not freeze instantly, but freezes gradually and becomes transparent ice. ...

*Some of the terminology that mentions "hard rime" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…あられのでき方と同じと考えてよい。(3)粗氷hard rime　過冷却雲粒が衝突してできるのは樹氷と同じであるが，半透明か透明に近い，堅い氷で，気温が0℃に近いときによくでき，粗氷はひょうのでき方に似ている。粗氷のできる条件よりもさらに気温が高く，霧雨や雨滴が付着すると瞬間的に凍りきれず，徐々に凍り透明な氷になる。…

※「hard rime」について言及している用語解説の一部を掲載しています。

出典｜株式会社平凡社世界大百科事典 第２版について | 情報