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.] (Zoöl.) 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 homœmorphous, but heteromerous.

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

3. (Zoöl.) (a) Having the femoral artery developed as the principal artery of the leg; — said of certain birds, as the cotingas and pipras. (b) Having five tarsal joints in the anterior and middle legs, but only four in the posterior pair, as the blister beetles and oil beetles.

(Het`er*o*mor"phic) a. [Hetero- + Gr. form.] (Biol.) Deviating from the normal, perfect, or mature form; having different forms at different stages of existence, or in different individuals of the same species; — applied especially to insects in which there is a wide difference of form between the larva and the adult, and to plants having more than one form of flower.

(Het`er*o*mor"phism Het`er*o*mor"phy) n. (Biol.) The state or quality of being heteromorphic.

(Het`er*o*mor"phous) a. (Biol.) Heteromorphic.

(||Het`e*ro*my*a"ri*a) n. pl. [NL., fr. Gr. other + a muscle.] (Zoöl.) A division of bivalve shells, including the marine mussels, in which the two adductor muscles are very unequal. See Dreissena, and Illust. under Byssus.

(||Het`e*ro*ne*re"is) n. [NL. See Hetero-, and Nereis.] (Zoöl.) A free- swimming, dimorphic, sexual form of certain species of Nereis.

In this state the head and its appendages are changed in form, the eyes become very large; more or less of the parapodia are highly modified by the development of finlike lobes, and branchial lamellæ, and their setæ become longer and bladelike.

(Het`er*on"o*mous) a. [Hetero- + Gr. no`mos law.] Subject to the law of another. Krauth-Fleming.

(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.

  By PanEris using Melati.

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