The Collaborative International Dictionary of English v.0.48:

Ingulf \In*gulf"\, v. t. [imp. & p. p. Ingulfed; p. pr. & vb.
   n. Ingulfing.] [Cf. Engulf.] [Written also engulf.]
   To swallow up or overwhelm in, or as in, a gulf; to cast into
   a gulf. See Engulf.
   [1913 Webster]

         A river large . . .
         Passed underneath ingulfed.              --Milton.
   [1913 Webster]