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English-Thai Dictionary

homology

N ภาวะ ที่ คล้าย กัน ภาวะ ที่ มี ความสัมพันธ์ เดียวกัน

Webster's 1913 Dictionary

HOMOLOGY

Ho *mol "o *gy, n. Etym: [Gr. Homologous. ]

1. The quality of being homologous; correspondence; relation; as, the homologyof similar polygons.

2. (Biol.)

Defn: Correspondence or relation in type of structure in contradistinction to similarity of function; as, the relation in structure between the leg and arm of a man; or that between the arm of a man, the fore leg of a horse, the wing of a bird, and the fin of a fish, all these organs being modifications of one type of structure.

Note: Homology indicates genetic relationship, and according to Haeckel special homology should be defined in terms of identity of embryonic origin. See Homotypy, and Homogeny.

3. (Chem. )

Defn: The correspondence or resemblance of substances belonging to the same type or series; a similarity of composition varying by a small, regular difference, and usually attended by a regular variation in physical properties; as, there is an homology between methane, CH4, ethane, C2H6, propane, C3H8, etc. , all members of the paraffin series. In an extended sense, the term is applied to the relation between chemical elements of the same group; as, chlorine, bromine, and iodine are said to be in homology with each other. Cf. Heterology. General homology (Biol.), the higher relation which a series of parts, or a single part, bears to the fundamental or general type on which the group is constituted. Owen. -- Serial homology (Biol.), representative or repetitive relation in the segments of the same organism, -- as in the lobster, where the parts follow each other in a straight line or series. Owen. See Homotypy. -- Special homology (Biol.), the correspondence of a part or organ with those of a different animal, as determined by relative position and connection. Owen.

New American Oxford Dictionary

homology

ho mol o gy |hōˈmäləjē, hə -hoʊˈmɑləʤi | ▶noun the quality or condition of being homologous. • Biology similarity in sequence of a protein or nucleic acid between organisms of the same or different species.

Sanseido Wisdom Dictionary

homology

ho mol o gy /hoʊmɑ́lədʒi |həmɔ́l -/名詞複 -gies U C 相応, 相似 ; 〘生物〙(異種器官の )相同 ; 〘化〙同族関係 ; 〘数〙ホモロジー .