crevice
crevice
/ˈkrevɪs/
a narrow opening in a rock or wall
Most of the year the insects are hidden in rock crevices.
Word Origin
Middle English: from Old French crevace, from crever ‘to burst’, from Latin crepare ‘to rattle, crack’.
e.g.
Including all my major crevices...and between my toes and in my belly button...which I never did before but sort of enjoyed. 主だった割れ目 足の指の間 おヘソ 生まれて初めて洗った (/yupeco/『ホーム・アローン』)