birthdays is a form of:

Birthday



noun
1.
(the anniversary of a person's irth, the day on which a person is born, yearly celebration of that day. -birthday suit bare skin, nakedness) ថ្ងៃខួប, ថ្ងៃកើត, បុណ្យខួបកំណើត
ENGLISH MEANING
noun
1.
The day in which any person is born; day of origin or commencement.
2.
The day of the month in which a person was born, in whatever succeeding year it may recur; the anniversary of one's birth.
adjective
1.
Of or pertaining to the day of birth, or its anniversary; as, birthday gifts or festivities.