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My name is H. K. Choi (최희광). I am currently Associate Professor of Biology at California State University Dominguez Hills. All views expressed on this blog are my own and do not reflect the views of my employers.

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ret·ro·grade
/ˈretrəˌɡrād/

adjective
directed or moving backward.
“a retrograde flow”
Similar: backward, backwards, reverse, rearward, directed backwards, retreating
Opposite: forward

noun (rare)
a degenerate person

verb
1. ARCHAIC
go back in position or time.
“our history must retrograde for the space of a few pages”
2. ASTRONOMY
show retrogradation.
“all planets will at some time appear to retrograde”