undercloak

English

Etymology

under- +‎ cloak

Noun

undercloak (plural undercloaks)

1. (construction) A fixed underlayer of tile or fibre cement on a roof, to support the mortar above.

Verb

undercloak (third-person singular simple present undercloaks, present participle undercloaking, simple past and past participle undercloaked)

1. (construction, transitive) To apply such an underlayer to.