Plain English Meaning
Metal pieces around the engine that guide the incoming air so it flows where the cooling is needed, instead of just rushing past.
Full Definition
Sheet-metal panels installed around an air-cooled aircraft engine that direct ram airflow over and between the cylinders to ensure even cooling during flight and ground operations.
Context Anchor
Seen during engine inspection and before-takeoff checks when confirming that the engine cooling system is intact and nothing is loose, damaged, or missing.
Derivation
From the older English verb 'baffle,' meaning to block, deflect, or divert. In the engine, the panels deflect airflow rather than letting it pass straight through, which is exactly what the word originally meant.