n.
Pronunciation: ˌ ē -( ˌ )k ō -k ə - ' tas-tr ə -f ē , ˌ e-( ˌ )k ō -
Function: noun
Date: 1969
: a major destructive upset in the balance of nature especially when caused by the action of humans
n.
Pronunciation: ˌ ē -( ˌ )k ō -k ə - ' tas-tr ə -f ē , ˌ e-( ˌ )k ō -
Function: noun
Date: 1969
: a major destructive upset in the balance of nature especially when caused by the action of humans
Merriam Webster Collegiate English Dictionary. Merriam Webster - Энциклопедический словарь английского языка. 2012