From ZooTerms (Dictionary of Invertebrate Zoology)
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reclivous also reclivate (adjective; Latin re, back; clivus, slope): 1. Having the form of a sigmoid curve; a convex and concave line.

2. (Arthropoda: Insecta) An insect wing vein having the front end farther from the wing base than the hind end

See also: verticle, inclivous