The Collaborative International Dictionary of English v.0.48:

instil \instil\ v. t.
   same as instill.

   Syn: instill.
        [WordNet 1.5]

The Collaborative International Dictionary of English v.0.48:

Instill \In*still"\, v. t. [imp. & p. p. Instilled; p. pr. &
   vb. n. Instilling.] [L. instillare, instillatum; pref. in-
   in + stillare to drop, fr. stilla a drop: cf. F. instiller.
   See Distill.] [Written also instil.]
   1. To drop in; to pour in drop by drop.
      [1913 Webster]

            That starlight dews
            All silently their tears of love instill. --Byron.
      [1913 Webster]

   2. Specifically: To infuse (knowledge or attitudes) into the
      mind of another, slowly or gradually; to impart gradually;
      to cause to be imbibed.
      [PJC]

            How hast thou instilled
            Thy malice into thousands.            --Milton.

   Syn: To infuse; impart; inspire; implant; inculcate;
        insinuate.
        [1913 Webster]

WordNet (r) 3.0 (2006):

instil
    v 1: enter drop by drop; "instill medication into my eye" [syn:
         instill, instil]