Webster's Revised Unabridged Dictionary · 1913

Interpenetrate

Interpenetrate , transitive verb

To penetrate between or within; to penetrate mutually.
It interpenetrates my granite mass. — Shelley

Interpenetrate , intransitive verb

To penetrate each the other; to penetrate between bodies or their parts.
Collocations (1)
Interpenetrating molding (Architecture) , in late Gothic architecture, a decoration by means of moldings which seem to pass through solid uprights, transoms, or other members; often, two sets of architectural members penetrating one another, in appearance, as if both had been plastic when they were put together.