a portable breathing device for free-swimming divers, consisting of a mouthpiece joined by hoses to one or two tanks of compressed air that are strapped on the back.
verb (used without object), scubaed, scubaing.

1950–55; s(elf)-c(ontained) u(nderwater) b(reathing) a(pparatus) Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
scuba (ˈskjuːbə)
a.  an apparatus used in skindiving, consisting of a cylinder or cylinders containing compressed air attached to a breathing apparatus
 b.  (as modifier): scuba diving
[C20: from the initials of self-contained underwater breathing apparatus]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1952, acronym for self-contained underwater breathing apparatus.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Abbreviations & Acronyms
self-contained underwater breathing apparatus
The American Heritage® Abbreviations Dictionary, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Example sentences
Underwater archaeology has mainly been the preserve of scuba divers.
The sensation of calm weightlessness reminded me of scuba diving.
There he picked up scuba diving, one of his many athletic pastimes.
As a scuba diver, this would give me more bottom time, and a more efficient way
  of doing the various stages of my dive.
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