A large pot used for processing jars when preserving food, either in a boiling water bath or by capturing steam to elevate the pressure and temperature.
(US, slang) Someone who lives off container deposit refunds from recycling.
An animal yielding inferior meat best suited to canning.
From Middle English canner (“maker of cans”), originally from the noun canne and equivalent to can + -er (occupational suffix). The modern senses reflect other meanings of the suffix -er.