Specifically, in zoology, having on your head any formation of parts or arrangement of colors like or likened to a hood, as with mammals, birds, etc.; cucullate; capistrate.
In botany, cucullate; getting the apex or edges curved up or curved over to be able to resemble the point of a slipper or a hood, whilst the spathe of the Indian turnip and/or lip of Cypripedium and Calypso. See cut-under Cypripedium.
How would you define hooded?