The term 'Trypanosomiasis Transmitter' refers to the TSETSE fly, which is a six-letter word. The TSETSE fly is a species of biting fly found in tropical and subtropical regions of Africa. It is the primary vector for a group of diseases known as trypanosomiasis, which are caused by the parasites Trypanosoma brucei and Trypanosoma gambiense. These parasites are transmitted to humans and animals through the bite of the TSETSE fly.