In Brazilian Portuguese, limão designates the fruit we know as lime. Small, green and round.
Our lemon, slightly bigger, yellow and not that round, is relatively uncommon in Brazil, and where found it is referred to as limão siciliano.
[Technical note for those interested in the intricacies of translation: the translators of British and American cookery programs regularly render lemon as limão. I think that’s fine, as using limão siciliano every time would be both wordy and slightly baffling for the Brazilian viewers. However, when an English-speaking cook uses both lemon and lime on the same recipe, the translator correctly uses the terms limão siciliano and limão.]
rio, brazil, ubatuba, paraty