Cardia is singular. Cardiae is plural.

Cardia Jackson was born on 1988-04-13.

"Cardia" is an anatomical term that refers to the part of the stomach that is attached to the esophagus. It has been stated that the cardia is more a part of the stomach than the esophagus.

Sottomayor Cardia has written:

'Socialismo sem dogma' -- subject(s): Socialism

Para Cardia: For Cardio

Its what you do for your cardio workout, you do it becuase you either want to loose weight or get fit.