adjective: Of or relating to Bartolomeo Eustachi (1500 or 1514–1574), also known as Eustachius, one of the founders of the science of human anatomy.
adjective: Alternative letter-case form of Eustachian [Of or relating to Bartolomeo Eustachi (1500 or 1514–1574), also known as Eustachius, one of the founders of the science of human anatomy.]