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say it: BURTH-day
birthday is a noun meaning "an anniversary of the day on which a person was born (or the celebration of it)". It carries 2 recorded senses.
an anniversary of the day on which a person was born (or the celebration of it)
Forms marked are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for birthday come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.