Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
ad-mĭnister, tri, m., he who is near to aid or assist, a servant, an attendant, assistant; lit. and trop. (class.)
Absol.: Jovi se consiliarium atque administrum datum, Cic. Leg. 3, 19, 43: cum neque bellum gerere sine administris posset, Sall. J. 74.
With gen.: puer victūs cotidiani administer, Cic. Rosc. Am. 28, 77: administri et satellites Sexti Naevii, id. Quint. 25, 80: satelles atque administer audaciae, id. Cat. 1, 3, 4: administer ipsius cupiditatum, id. Verr. 2, 2, 54: rerum transactor et administer, id. ib. 2, 69: socius et administer omnium consiliorum, Sall. J. 29, 2.
With ad: administris ad ea sacrificia Druidibus utuntur, Caes. B. G. 6, 16.
admĭnistra, ae, f. [administer], a female servant, assistant, or helper, a handmaid.
Lit. and fig.: “Camillam qui glossemata interpretati dixerunt administram,” Varr. L. L. 7, § 34 Müll.: multae sunt artes eximiae hujus administrae comitesque virtutis, Cic. Imp. Pomp. 13, 36.