JMdict: 1464870

日夜 【にちや】

  1. [adv,n] day and night; around the clock; always; constantly
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Kanji in this word:

Kanji Meanings On Readings Kun Readings Grade
日 Day, Sun, Japan, Counter For Days ニチ, ジツ ひ, -び, -か 1
夜 Night, Evening ヤ よ, よる 2

Words often seen with this one: (experimental feature)

月 (20), 昨 (19), 時 (17), 夜 (11), 大河 (11)