Interstice

interstice
    n 1: a small structural space between tissues or parts of an
         organ; "the interstices of a network"
    2: small opening between things
    

Interstice \In*ter"stice\ (?; 277), n.; pl. {Interstices}. [L.
   interstitium a pause, interval; inter between + sistere to
   set, fr. stare to stand: cf. F. interstice. See {Stand}.]
   [1913 Webster]
   1. That which intervenes between one thing and another;
      especially, a space between things closely set, or between
      the parts which compose a body; a narrow chink; a crack; a
      crevice; a hole; an interval; as, the interstices of a
      wall.
      [1913 Webster]

   2. An interval of time; specifically (R. C. Ch.), in the
      plural, the intervals which the canon law requires between
      the reception of the various degrees of orders.
      [1913 Webster]

            Nonobservance of the interstices . . . is a sin.
                                                  --Addis &
                                                  Arnold.
      [1913 Webster]
    

26 Moby Thesaurus words for "interstice":
      caesura, clearance, discontinuity, distance between, double space,
      em space, en space, freeboard, hair space, half space, hiatus,
      interim, intermediate space, interruption, interspace, interval,
      jump, lacuna, leap, leeway, margin, room, single space, space,
      space between, time interval