From WordNet (r) 2.0 (August 2003) [wn]:
interstice
n 1: a small structural space between tissues or parts of an
organ; "the interstices of a network"
2: small opening between things
From The Collaborative International Dictionary of English v.0.48 [gcide]:
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]