the GNU version of the Collaborative International Dictionary of English
adj. Bent backward or downward.
The Century Dictionary and Cyclopedia
In botany and zoology, turned back; directed backward; retral.
In ornithology, turned in a direction the opposite of the usual one, without reference to any other line or plane; antrorse. See the quotation.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
adj. bent or curved backward or downward
Word Usage
"The fish you really have to watch out for is the candirú, a toothpick-shaped catfish that wriggles into bodily orifices, throws out retrorse spines, and can be removed only through surgery."