Zoology. the fat layer between the skin and muscle of whales and other cetaceans, from which oil is made.
excess body fat.
an act of weeping noisily and without restraint.
verb (used without object)
to weep noisily and without restraint: Stop blubbering and tell me what's wrong.
verb (used with object)
to say, especially incoherently, while weeping: The child seemed to be blubbering something about a lost ring.
to contort or disfigure (the features) with weeping.
disfigured with blubbering; blubbery: She dried her blubber eyes.
fatty; swollen; puffed out (usually used in combination): thick, blubber lips; blubber-faced.

1250–1300; Middle English bluber bubble, bubbling water, entrails, whale oil; apparently imitative

blubberer, noun
blubberingly, adverb Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
blubber (ˈblʌbə)
1.  to sob without restraint
2.  to utter while sobbing
3.  (tr) to make (the face) wet and swollen or disfigured by crying
4.  a thick insulating layer of fatty tissue below the skin of aquatic mammals such as the whale: used by man as a source of oil
5.  informal excessive and flabby body fat
6.  the act or an instance of weeping without restraint
7.  (Austral) an informal name for jellyfish
8.  (often in combination) swollen or fleshy: blubber-faced; blubber-lips
[C12: perhaps from Low German blubbern to bubble, of imitative origin]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

late 14c., blober "a bubble," probably echoic of bubbling water. Original notion of "bubbling, foaming" survives in the figurative meaning "to cry" (c.1400). Meaning "whale fat" first attested 1660s; earlier it was used in ref. to jellyfish (c.1600).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
blubber   (blŭb'ər)  Pronunciation Key 
The thick layer of fat between the skin and the muscle layers of whales and other marine mammals. It insulates the animal from heat loss and serves as a food reserve.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Humans no longer require oil from whale blubber, the only value whaling has is
  as an dietary vanity gesture.
Penguin eggs and slabs of blubber line the entrance.
Speaking of seal blubber, the fatty substance may be more vital to polar bear
  survival than previously known.
Otters do not have blubber, and use their fur and their high metabolisms to
  keep warm.
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