How do I Say and Write
"Birthday" in Portuguese?

Pronunciation : Birth"day`
Part of Speech : n.
Definition : 1. The day in which any person is born; day of origin or commencement. Those barbarous ages past, succeeded next The birthday of invention. Cowper.

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. This is my birthday; as this very day Was Cassius born. Shak.
Source : Webster's Unabridged Dictionary, 1913

Pronunciation : Birth"day`
Part of Speech : a.
Definition : Defn: Of or pertaining to the day of birth, or its anniversary; as, birthday gifts or festivities.
Source : Webster's Unabridged Dictionary, 1913