First Diagonal Branch Artery

The first artery arising from the left anterior descending (LAD) artery that supplies the anterolateral wall, when counted from proximal to distal. (NCI Thesaurus)

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First Degree Uterine Prolapse

The uterus has descended above the hymen.

First Degree Relative

Any relative who is one meiosis away from a particular individual in a family; a relative with whom one half of an…

First Cousin Once Removed

A child of your first cousin.

First Cousin

A child of your aunt or uncle.

First Aid

Accidents happen. Someone chokes on an ice cube or gets stung by a bee. It is important to know when to call…

First

Preceding all others in time or space or degree.