ESTRUATION Meaning of ESTRUATION in English nounor oes·tru·a·tion ˌestrəˈwāshən( -s )Etymology: New Latin estru m, oestru m + English -ation 1. : the condition of being in estrus2. : estrus Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012