Marsupial \Mar*su"pi*al\, a. [Cf. F. marsupial.] 1. (Zo["o]l.) Having a pouch for carrying the immature young; of or pertaining to the Marsupialia. 2. (Anat. & Zo["o]l.) Of or pertaining to a marsupium; as, the marsupial bones. {Marsupial frog}. (Zo["o]l.) See {Nototrema}.