a subordinate type.
a special type included within a more general type.
a secondary or subordinate type or genre, esp a specific one considered as falling under a general classification
If S is a subtype of T then an expression of type S may be used anywhere that one of type T can and an implicit type conversion will be applied to convert it to type T.
In object oriented programming, this means that objects of type S must accept every message that one of type T would.
adjective, Biology. 1. slender, somewhat cylindrical, and tapering to a point; awl-shaped. adjective 1. (esp of plant parts) tapering to a point; awl-shaped
noun, Zoology. 1. the concave undersurface of a coelenterate medusa, as a jellyfish.
adjective 1. of, pertaining to, bearing, or shaped like a nail, claw, or hoof. adjective 1. of, relating to, or affecting the fingernails or toenails 2. of or relating to an unguis subungual sub·un·gual (sŭb-ŭng’gwəl) or sub·un·gui·al (-gwē-əl) adj. Beneath a fingernail or toenail. ungual un·gual (ŭng’gwəl) adj. Of or relating to fingernails or toenails.