UNDERREAMER


Meaning of UNDERREAMER in English

ˈ ̷ ̷ ̷ ̷ˌ ̷ ̷ ̷ ̷ noun

: a reamer for operating below the casing of a borehole to enlarge the hole for the reception of the pipe

Webster's New International English Dictionary.      Новый международный словарь английского языка Webster.