botfly: stout-bodied hairy dipterous fly whose larvae are parasites on humans and other mammals
gadfly: any of various large flies that annoy livestock
ribonucleic acid: (biochemistry) a long linear polymer of nucleotides found in the nucleus but mainly in the cytoplasm of a cell where it is associated with microsomes; it transmits genetic information from DNA to the cytoplasm and controls certain chemical processes in the cell