undercloak

/ˈʌndə(ɹ)kləʊk/

Etymology

From under- + cloak.

undercloak means A fixed underlayer of tile or fibre cement on a roof, to support the mortar above. Lexicurio rates it Sui generis — a strength score of 86 out of 100.

noun

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

verb

To apply such an underlayer to.