I. adjective
or al·lan·toi·di·an |alən.|tȯidēən, |aˌlan.-; ə|lantə|wid-
Etymology: New Latin allantoid-, allantois + English -ean, -ian
: of, relating to, or derived from the allantois
II. adjective
Etymology: New Latin Allantoidea + English -an
: of or relating to the Allantoidea