amphistomous adjective2 •Having a sucker or opening at each extremity.Some entozoa are amphistomous. •Having stomata on both surfaces of the leaf.Adaxial and abaxial surfaces of three taxa of the Acutae group in the Pacific Northwest (C. aquatilis, C. lenticularis, and C. nebrascensis) are not differentiated (the amphistomous condition) . — 1985