(This etymology is missing or incomplete. Please add to it, or discuss it at the Etymology scriptorium.)
From a Malagasy word, literally meaning "strong fever".
2016 March 5, ““ Tazomoka Is Not a Problem”. Local Perspectives on Malaria, Fever Case Management and Bed Net Use in Madagascar”, in PLOS ONE[1], →DOI:
According to local perceptions in all areas, tazo and tazomahery were not caused by mosquitos.