crevice

rako A narrow crack or fissure, as in a rock or wall.
Tennyson

The mouse, / Behind the moldering wainscot, shrieked, / Or from the crevice peered about.

I can't tell you how urbane and sprightly the old poll parrot was; and (..) not a pocket, not a crevice, of pomp, humbug, respectability in him: he was fresh as a daisy.

(rfquotek)