Part 818

1. (Bot.) The process of fertilization in plants by an indirect or circuitous method; -- opposed to orthogamy.

2. (Biol.) That form of alternate generation in which two kinds of sexual generation, or a sexual and a parthenogenetic generation, alternate; -- in distinction from metagenesis, where sexual and asexual generations alternate. Claus & Sedgwick.

Het`er*o*gan"gli*ate (?), a. [Hetero- + gangliate.] (Physiol.) Having the ganglia of the nervous system unsymmetrically arranged; -- said of certain invertebrate animals.

Het"er*o*gene (?), a. Heterogenous. [Obs.]

Het`er*o*ge"ne*al (?), a. Heterogeneous.

Het`er*o*ge*ne"i*ty (?), n. [Cf. F. hÈtÈrogÈnÈitÈ.] The state of being heterogeneous; contrariety.

The difference, indeed the heterogeneity, of the two may be felt.

Coleridge.

Het`er*o*ge"ne*ous (?), a. [Gr. &?;; &?; + &?; race, kind; akin to E. kin: cf. F. hÈtÈrogËne.] Differing in kind; having unlike qualities; possessed of different characteristics; dissimilar; -- opposed to homogeneous, and said of two or more connected objects, or of a conglomerate mass, considered in respect to the parts of which it is made up. -- Het`er*o*ge"ne*ous*ly, adv. -- Het`er*o*ge"ne*ous*ness, n.

Heterogeneous nouns (Gram.), nouns having different genders in the singular and plural numbers; as, hic locus, of the masculine gender in the singular, and hi loci and hÊc loca, both masculine and neuter in the plural; hoc cÊlum, neuter in the singular; hi cÊli, masculine in the plural. -- Heterogeneous quantities (Math.), such quantities as are incapable of being compared together in respect to magnitude, and surfaces and solids. -- Heterogeneous surds (Math.), surds having different radical signs.

Het`er*o*gen"e*sis (?), n. [Hetero- + genesis.] 1. (Biol.) Spontaneous generation, so called.

2. (Biol.) That method of reproduction in which the successive generations differ from each other, the parent organism producing offspring different in habit and structure from itself, the original form, however, reappearing after one or more generations; -- opposed to homogenesis, or gamogenesis.

Het`er*o*ge*net"ic (?), a. (Biol.) Relating to heterogenesis; as, heterogenetic transformations.

Het`er*og"e*nist (?), n. (Biol.) One who believes in the theory of spontaneous generation, or heterogenesis. Bastian.

Het`er*og"e*nous (?), a. (Biol.) Of or pertaining to heterogenesis; heterogenetic.

Het`er*og"e*ny (?), n. (Biol.) Heterogenesis.

Het`er*og"o*nous (?), a. (Bot.) Characterized by heterogony. -- Het`er*og"o*nous*ly, adv.

Het`er*og"o*ny (?), n. [Hetero- + Gr. &?; offspring.] (Bot.) The condition of having two or more kinds of flowers, different as to the length of their stamens and pistils.

Het`er*o*graph"ic (?), a. [See Heterography.] Employing the same letters to represent different sounds in different words or syllables; -- said of methods of spelling; as, the ordinary English orthography is heterographic.

Het`er*og"ra*phy (?), n. [Hetero- + -graphy.] That method of spelling in which the same letters represent different sounds in different words, as in the ordinary English orthography; e. g., g in get and in ginger.

Het`er*og"y*nous (?), a. [Hetero- + Gr. &?; a woman, female.] (Zoˆl.) Having females very unlike the males in form and structure; -- as certain insects, the males of which are winged, and the females wingless.

Het`er*ol"o*gous (?), a. [Hetero- + Gr. &?; proportion.] Characterized by heterology; consisting of different elements, or of like elements in different proportions; different; -- opposed to homologous; as, heterologous organs.

Heterologous stimulus. (Physiol.) See under Stimulus. -- Heterologous tumor (Med.), a tumor differing in structure from the normal tissues of the body.

Het`er*ol"o*gy (?), n. [Hetero- + -logy.] 1. (Biol.) The absence of correspondence, or relation, in type of structure; lack of analogy between parts, owing to their being composed of different elements, or of like elements in different proportions; variation in structure from the normal form; -- opposed to homology.

2. (Chem.) The connection or relation of bodies which have partial identity of composition, but different characteristics and properties; the relation existing between derivatives of the same substance, or of the analogous members of different series; as, ethane, ethyl alcohol, acetic aldehyde, and acetic acid are in heterology with each other, though each in at the same time a member of a distinct homologous series. Cf. Homology.

||Het`e*rom"e*ra (?), n. pl. [NL., fr. Gr. &?; other + &?; part.] ||(Zoˆl.) A division of Coleoptera, having heteromerous tarsi.

Het`er*om"er*ous (?), a. [See Heteromera.] 1. (Chem & Crystallog.) Unrelated in chemical composition, though similar or indentical in certain other respects; as, borax and augite are homúmorphous, but heteromerous.

2. (Bot.) With the parts not corresponding in number.