/re'treuh gresh"euhn/ , n.
1. the act of retrogressing; movement backward.
2. Biol. degeneration; retrograde metamorphosis; passing from a more complex to a simpler structure.
[ 1640-50; retrogress ( us ) (see RETROGRESS) + -ION ]
/re'treuh gresh"euhn/ , n.
1. the act of retrogressing; movement backward.
2. Biol. degeneration; retrograde metamorphosis; passing from a more complex to a simpler structure.
[ 1640-50; retrogress ( us ) (see RETROGRESS) + -ION ]
Random House Webster's Unabridged English dictionary. Полный английский словарь Вебстер - Random House . 2012