isomer=أيسومر

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isomer= ايزومير     /  أيسومر

ONLINE ETYMOLOGY DICTIONARY:

isomer (n.)

1866, back formation from isomeric; cf. Gk. isomeres "sharing equality," from iso- (see iso-) + meros "part, share" (see merit (n.)).

iso-

word-forming element meaning "equal, similar, identical; isometric," from comb. form of Gk. isos "equal to, the same as" (e.g. isometor "like one's mother"). Used properly only with words of Greek origin; the Latin equivalent is equi- (see equi-).

merit (n.)

c.1200, "spiritual credit" (for good works, etc.); c.1300, "spiritual reward," from O.Fr. merite "wages, pay, reward; thanks; merit, moral worth, that which assures divine pity," and directly from L. meritum "a merit, service, kindness, benefit, favor; worth, value, importance," neuter of meritus, pp. of merere, meriri "to earn, deserve, acquire, gain," from PIE root *(s)mer- "to allot, assign" (cf. Gk. meros "part, lot," moira "share, fate," moros "fate, destiny, doom," Hittite mark "to divide" a sacrifice).

WIKIPEDIA

In chemistry, isomers (pronounced /ˈaɪsəmə(ɹ)z/; from Greek ἰσομερής, isomerès; isos = "equal", méros = "part") are compounds with the same molecular formula but different structural formulas.[1] Isomers do not necessarily share similar properties, unless they also have the same functional groups. There are many different classes of isomers, like stereoisomers, enantiomers, geometrical isomers, etc. (see chart below). There are two main forms of isomerism: structural isomerism and stereoisomerism (spatial isomerism).