JMdict: 2073930

危険日 【きけんび】

  1. [n] unsafe day (when unprotected sex can to lead to conception)
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Kanji in this word:

Kanji Meanings On Readings Kun Readings
危 Dangerous, Fear, Uneasy キ あぶ.ない, あや.うい, あや.ぶむ
険 Precipitous, Inaccessible Place, Impregnable Position, Steep Place, Sharp Eyes ケン けわ.しい
日 Day, Sun, Japan, Counter For Days ニチ, ジツ ひ, -び, -か