ETYMOLOGY
from descent + -ive
EXAMPLE
“… howsoeuer I purpose not in the like nice respect to leape ouer the laudable petigree of Yarmouth, but will fetch her from her swadling clouts or infancy, & reueale to you when and by whom she was first raught out of the oceans armes, and start vp and aspired to such starry sublimitie ; as also acquaint you with the notable immunities, franchises, priuileges she is endowed with beyond all her confiners, by the discentiue line of kings from the conquest. …”
From: Lenten Stuffe
By Thomas Nashe, 1599
The Praise of the Red Herring
Lexicophilia 