The Collaborative International Dictionary of English v.0.48:

Interjacent \In`ter*ja"cent\, a. [L. interjacens, -entis, p. pr.
   of interjacere to lie between; inter between + jac[=e]re to
   lie.]
   Lying or being between or among; intervening; as, interjacent
   isles. --Sir W. Raleigh.
   [1913 Webster]