мо́щи

1.
relics, holy relics, remains of a saintreligion
В монастыре́ храня́тся мо́щи святого.
The relics of the saint are kept in the monastery.
Plural only. Refers to the incorrupt or preserved body of a saint kept for veneration.
2.
bag of bones, skin and bones, walking skeleton
Он так исхудал, что стал похо́ж на живы́е мо́щи.
He has grown so thin that he looks like a walking skeleton.
Colloquial and jocular; often in the phrase живые мощи 'living relics'.

Examples

Мощи святого считались нетленными веками.
The saint’s relics were considered incorruptible for centuries.
В крипте хранятся мощи святых.
The relics of the saints are kept in the crypt.