Function: noun
Date: 1933
: a conical fragment of rock that has striations radiating from the apex and that is formed by high pressure (as from volcanism or meteorite impact)
Function: noun
Date: 1933
: a conical fragment of rock that has striations radiating from the apex and that is formed by high pressure (as from volcanism or meteorite impact)
Merriam Webster Collegiate English Dictionary. Merriam Webster - Энциклопедический словарь английского языка. 2012