The word was coined by William Kirby and William Spence in their Introduction to Entomology in the early 1800s: "In the terminology, or what, to avoid the barbarism of a word compounded of Latin and Greek, [Kirby and Spence] would beg to call orismology of the science, they have endeavoured to introduce throughout a greater degree of precision and concinnity" in the terms used to talk about insects.
Entomologists William Kirby and William Spence introduced the term in the early 1800s, seeking to refine and systematize the language used to discuss insects.