\Ac`ro*a*mat"ic\, Acroamatical \Ac`ro*a*mat"ic*al\,
a. [Gr. ?, fr. ? to hear.]
Communicated orally; oral; -- applied to the esoteric
teachings of Aristotle, those intended for his genuine
disciples, in distinction from his exoteric doctrines, which
were adapted to outsiders or the public generally. Hence:
Abstruse; profound.