Medical Definition of wax
1: a substance that is secreted by bees and is used by them for constructing the honeycomb, that is a dull yellow solid plastic when warm, and that is composed of a mixture of esters, cerotic acid, and hydrocarbons—called also beeswax
2: any of various substances resembling beeswax: asa: any of numerous substances of plant or animal origin that differ from fats in being less greasy, harder, and more brittle and in containing principally compounds of high molecular weight (as fatty acids, alcohols, and saturated hydrocarbons)b: a pliable or liquid composition used especially in uniting surfaces, excluding air, making patterns or impressions, or producing a polished surface <dental waxes>
3: a waxy secretion; especially : earwax
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