DicionárioMédico.com consists of the largest free online medical dictionary, with almost 10,000 medical terms explained in a simple and accessible language. You can use this medical dictionary through the alphabetical index or by using the search tool. You can perform a search for an exact term by selecting ‘terms only’ OR a generalized search by selecting ‘all’.
You can find the dictionary online at the following link: https://www.xn--dicionriomdico-0gb6k.com/
In infopedia you can find the terminological dictionaries related to this specific topic. There is one related to contagious ailments and another with the most searched medical terms.
You can find both terminological dictionaries by following this link: https://www.infopedia.pt/dicionarios/termos-medicos
For Brazilian Portuguese you can consult the glossary of the Dicionário Médico Boa Saude, where you can find the most searched terms in alphabetical order.
You can find this glossary here: https://www.boasaude.com.br/dicionario-medico/