means A broad, shallow metal container with a handle, used for cooking food over heat — or, as a verb, to criticize harshly or to swing a camera in a slow sweep.

from From Old English 'panne,' shared with Dutch 'pan' and German 'Pfanne,' all likely borrowed early from Late Latin 'panna,' a shortened form of 'patina,' a shallow dish. The harsh-criticism sense ('the critics panned it') is 19th-century slang, probably from the idea of striking or hammering something in a pan. The camera 'pan' is unrelated — it's a clipping of 'panorama,' from Greek 'pan' (all) + 'horama' (view), so it shares nothing with the cooking pan but the spelling.