The word hummock means a rounded knoll or hillock that is made by ants as they dig their nests. This word can also be used to refer to a ridge of ice. It is a noun and is pronounced as hamek'.
Ask.com Answer for: what is the definition of hummock
A hummock (of uncertain derivation; cf. hump or hillock) is a boss or rounded knoll of ice rising above the general level of an ice-field, making sledge travelling in the Arctic and Antarctic region...