Rosh Chodesh
/rɒʃ ˈxɒdɛʃ/ /rɒʃ ˈxəʊdəʃ/ /rɒʃ ˈhɒdɛʃ/Judaism
noun
The observance of the appearance of the new moon, marking the beginning of the Jewish month; the first day of the Jewish month.
Origin
Mid 18th century. From post-biblical Hebrew rō'š ḥodeš first day of the month from biblical Hebrew rō'š beginning + ḥodeš month.