skipjack

[skip-jak]
noun, plural (especially collectively) skipjack (especially referring to two or more kinds or species) skipjacks for 1; skipjacks for 2, 3.
1.
any of various fishes that leap above the surface of the water, as a tuna, Euthynnus pelamis, or the bonito.
2.
Entomology, click beetle.
3.
Nautical. an American one-masted sailing vessel.

Origin:
1545–55; skip1 + jack1

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
skipjack (ˈskɪpˌdʒæk)
 
n , pl -jack, -jacks
1.  Also called: skipjack tuna an important food fish, Katsuwonus pelamis, that has a striped abdomen and occurs in all tropical seas: family Scombridae (mackerels and tunas)
2.  black skipjack a small spotted tuna, Euthynnus yaito, of Indo-Pacific seas
3.  any of several other unrelated fishes, such as the alewife and bonito
4.  nautical an American sloop used for oystering and as a yacht
5.  another name for a click beetle
 
[C18: from skip1 + jack1]

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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Etymonline
Word Origin & History

skipjack
1554, "a pert shallow-brained fellow, a puppy, a conceited fop" [OED], from skip (v.) + generic name jack. Applied 1703 to tropical fishes with leaping tendencies. In ref. to a kind of sailing boat used on Chesapeake Bay, attested from 1887.
Online Etymology Dictionary, © 2010 Douglas Harper
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FOLDOC
Computing Dictionary

SkipJack definition

cryptography
An encryption algorithm created by the NSA (National Security Agency) which encrypts 64-bit blocks of data with an 80-bit key. It is used in the Clipper chip, a VLSI device with an ARM processor core, which is intended to perform cryptographic operations while allowing the security agencies listen in.
There are (apparently) two agencies, both of whom have to agree that there is a valid reason to decode a message. Don't laugh, they are serious.
[Algorithm?]
(1995-12-07)

The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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Encyclopedia Britannica
Encyclopedia

skipjack

any of approximately 7,000 species of beetles (insect order Coleoptera) named for the clicking noise made when seized by a predator. Most click beetles range between 2.5 and 18 mm (less than 34 inch) in length and are brown or black in colour with either little or no ornamentation. However, some tropical species are brightly coloured or luminescent. Click beetles have elongated bodies with parallel sides and bluntly rounded ends

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
Fishmongers sometimes get caught labeling, for example, skipjack tuna as more expensive yellowtail.
Anglers can fish for trout, flounder, skipjack and more from piers and jetties.
Anglers enjoy catching skipjack herring, as they frequently jump during the fight.
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