The Gascon uttered a furious imprecation, which was answered by a wild laugh on another aspect with the iron panel. There are actually 36 meanings shown in OED's entry with the noun panel, nine of that happen to be labelled obsolete. See ‘Indicating & use’ for definitions, use, and quotation https://www.offwalk.com/ensure-your-business-runs-smoothly-with-expert-refrigerator-repair-services/