The Collaborative International Dictionary of English v.0.48:

Agminate \Ag"mi*nate\, Agminated \Ag"mi*na`ted\, a. [L. agmen,
   agminis, a train, crowd.] (Physiol.)
   Grouped together; as, the agminated glands of Peyer in the
   small intestine.
   [1913 Webster]