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retrogression

[re-truh-gresh-uhn]

Origin

noun

the act of retrogressing; movement backward.

Biology. degeneration; retrograde metamorphosis; passing from a more complex to a simpler structure.

Origin:
1640–50; < Latin retrōgress(us) (see retrogress) + -ion

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Based on the Random House Dictionary, © Random House, Inc. 2012.
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Link To retrogression

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Retrogression is always a great word to know.

So is clone. Does it mean:

a cell or organism that is genetically identical to the individual from which it was derived

a cell in loose connective tissue that is specialized for the synthesis and storage of fat

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Collins

World English Dictionary

retrogress (ˌrɛtrəʊˈɡrɛs)

—vb
1.	to go back to an earlier, esp worse, condition; degenerate or deteriorate
2.	to move backwards; recede
3.	biology to develop characteristics or features of lower or simpler organisms; degenerate

[C19: from Latin retrōgressus having moved backwards, from retrōgradī; see retrograde]

retro'gression

—n

retro'gressive

—*adj*

retro'gressively

—*adv*

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

Word Origin & History

retrogression

1646, formed on model of progression from L. retrogressus, pp. of retrogradi "move backward" (see retrograde).

Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage

Medical Dictionary

retrogression ret·ro·gres·sion (rět'rə-grěsh'ən)
n.