Definition of sub-shaft in English:

sub-shaft

noun

  • 1Architecture. A shaft bearing a sub-arch. Now rare.

  • 2Engineering. A subsidiary or auxiliary shaft.

Origin

Mid 19th century; earliest use found in Robert Willis (1800–1875), engineer and architectural historian. From sub- + shaft.

Pronunciation

sub-shaft

/ˈsʌbʃɑːft//ˈsʌbʃaft/