vug
Concise Oxford English Dictionary © 2008 Oxford University Press:
vug /vʌg/
▶noun Geology a cavity in rock, lined with mineral crystals.
– derivatives
vuggy adjective,
vugular adjective.
vuggy adjective,
vugular adjective.
– origin C19: from Cornish vooga.
'vug' also found in these Oxford entries:

