scu·ba

[skoo-buh] noun, verb, scu·baed, scu·ba·ing.
noun
1.
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)

Origin:
1950–55; s(elf)-c(ontained) u(nderwater) b(reathing) a(pparatus)

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
scuba (ˈskjuːbə) [Click for IPA pronunciation guide]
 
n
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
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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00:10
Scuba is one of our favorite verbs.
So is lollygag. Does it mean:
to flee; abscond:
to spend time idly; loaf.
Etymonline
Word Origin & History

scuba
1952, acronym for self-contained underwater breathing apparatus.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Abbreviations & Acronyms
scuba
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
Snorkelers and scuba divers trample on the reefs, sometimes breaking off chunks
  of coral as souvenirs.
Besides, while scuba diving is a fun approximation of free fall, it's still not
  the real thing.
More information on scuba diving is available on their web site or from local
  scuba shops in the area.
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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