An Etymological Dictionary of Astronomy and Astrophysics
English-French-Persian

A combining form meaning "false, erroneous, pretended, unreal," used in the formation of compound words (pseudonym, pseudoclassic, pseudointellectual). In scientific use, denoting close or deceptive resemblance to the following element (pseudogene, pseudobulb, pseudocarp).
→ pseudo-disk, → pseudo-Euclidean space, → pseudo-nucleus, → pseudo-Riemannian space, → pseudoscience.

From Gk. pseudo-, combining form of pseudes "false," or pseudos "falsehood," both from pseudein "to lie, cheat, falsify."

Doruž-, from Mid.Pers. druž "false, untrue, deceptive" (Mod.Pers. doruq "lie"), drôzitan, druxtan "to lie;" O.Pers. drauga- "lie;" Av. drug- "to lie," družaiti "he lies, cheats;" cf. Skt. druhyati "he lies," drôha-, drôgha- "insult, injury," druh- "damage; ghost;" O.H.G. triogan "to deceive;" Ger. trügen "to deceive;" E. dream; PIE base *dhrugh- "to deceive, harm."

A general designation for both → box-peanut and → disk-like bulges. Although both, as opposed to the → classical bulges, show important rotational support, they also have different properties.

→ pseudo-; → bulge.

A mass structure around a → protostar that resembles an → accretion disk, but is in fact a simple flattened envelope.

→ pseudo-; → disk.

A real vector space of dimension n having a symmetric bilinear form (x, y) such that in some basis e₁, ..., e_n, the quadratic form (x²) takes the form x₁² + ... + x_{n - 1}² - x_n². Such bases are called orthonormal.

→ pseudo-; → Euclidean; → space.

Same → false nucleus.

→ pseudo-; → nucleus.

A space with an affine connection (without torsion), at each point of which the tangent space is a → pseudo-Euclidean space (Encyclopedia of Mathematics, Kluwer Academic Publications, Editor in chief I. M. Vinogradov, 1991).

→ pseudo-; → Riemannian; → space.