Гроулера е парче лед, който се отделя от айсберги или ледници (този процес се нарича „откъртване“) и лед.
Плава  в открити води и може да бъде пречка за малките лодки.

Според  NOAA Ocean Service, гроулера  е парче лед, по-малко от 1 метър над морското равнище и на по-малко от 5 метра.

Growler on Hornsund fiord near Hans Glacier, Spitsbergen (author: Piotr Andryszczak)

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