Final answer:
The term 'supracostal' means above or outside the ribs, while 'gastralgia' refers to stomach pain.
Step-by-step explanation:
The term supracostal means above or outside the ribs. It is derived from the Latin words 'supra' meaning above, and 'costal' referring to the ribs. In medical terminology, 'supra-' is a prefix used to indicate a position that is above or on top of a certain body part. In contrast, the term 'gastralgia' has a different meaning; it refers to pain in the stomach area, with 'gastro-' relating to the stomach and '-algia' meaning pain.