Oxford Advanced American Dictionary

Definition of snorkelling noun from the Oxford Advanced Learner's Dictionary

snorkelling

noun (especially US snorkeling)
snorkelling pronunciation English ˈsnɔːkəlɪŋ snorkelling pronunciation American ˈsnɔːrkəlɪŋ
[uncountable]
 
the sport or activity of swimming underwater with a snorkel
to go snorkelling