arsinoitherium - an extinct genus of mammals, related to elephants, sirenians and hyraxes, superficially resembling a two horned rhinoceros
#AppendixNLocutionOfTheDay from Gene Wolfe's The Citadel of the Autarch. A varied group of forces aligns to hold the line of battle, and Severian notes the impressive Daughters of War amongst the all-male light cavalry.