presidiary
pre·sid·i·al
(prĭ-sĭd′ē-əl) also pre·sid·i·ar·y (-ĕr′ē)adj.
Of, relating to, possessing, or being a garrison.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.