n. [ Pseudo- + -scope. ] (Opt.) An instrument which exhibits objects with their proper relief reversed; -- an effect opposite to that produced by the stereoscope. Wheatstone. [ 1913 Webster ]

a. (Opt.) Of, pertaining to, or formed by, a pseudoscope; having its parts appearing with the relief reversed; as, a pseudoscopic image. [ 1913 Webster ]

‖n. pl. [ NL. See Pseudo-, and Scorpion. ] (Zool.) An order of Arachnoidea having the palpi terminated by large claws, as in the scorpions, but destitute of a caudal sting; the false scorpions. Called also Pseudoscorpii, and Pseudoscorpionina. See Illust. of Book scorpion, under Book. [ 1913 Webster ]

n. [ Pseudo- + sphere. ] (Geom.) The surface of constant negative curvature generated by the revolution of a tractrix. This surface corresponds in non-Euclidian space to the sphere in ordinary space. An important property of the surface is that any figure drawn upon it can be displaced in any way without tearing it or altering in size any of its elements. [ 1913 Webster ]

n. [ Pseudo- + spore. ] (Bot.) A peculiar reproductive cell found in some fungi. [ 1913 Webster ]

‖n.; pl. -læ. [ NL., fr. Gr. pseydh`s false + L. stella star. ] (Astron.) Any starlike meteor or phenomenon. [ R. ] [ 1913 Webster ]

‖n.; pl. Pseudostomata [ NL. See Pseudo-, and Stoma. ] (Anat.) A group of cells resembling a stoma, but without any true aperture among them. [ 1913 Webster ]