Etymology
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Words related to iso-

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isomeric (adj.)

"pertaining to or characterized by isomerism," 1831, from German isomerisch (Berzelius, 1831, in a paper on the "Composition of the Tartaric and Paratartaric Racemic Acids"), from Greek isomeres "sharing equality, having equal parts or shares," from iso- "equal" (see iso-) + meros "part, share" (from PIE root *(s)mer- (2) "to get a share of something"). Isomerous is from 1845 in botany, 1840 in chemistry.

isometric (adj.)
1838, literally "of the same measure," from iso- "the same, equal" + -metric. The components are Greek: isos "equal, identical" + metron "a measure." Originally a method of using perspective in drawing; later in reference to crystals. The physiological sense relating to muscular action is from 1889, from German isometrisch in this sense (1882).
isomorphic (adj.)

"the same in form, alike," 1862 [Robert Gordon Latham, "Elements of Comparative Philology"], from iso- "equal, identical" + -morphic, from Greek morphē "form, shape," a word of uncertain etymology. Earlier adjective was isomorphous (1821).

isomorphism (n.)

"similarity of form," 1822, in John George Children's translation from French of Berzelius's "The Use of the Blow-pipe in Chemical Analysis," from French l'isomorphisme, from German Isomorphismus (1819), coined by German chemist Eilhard Mitscherlich (1794-1863) from Greek isos "equal, identical" (see iso-) + morphe "form, appearance," a word of uncertain etymology.

Mr. Children has, very properly in our estimation, wholly omitted the formulae, translating them into plain English in notes at the bottom of the page; we wish he had exerted the same discretionary judgment with respect to the isomorphisms and left them out likewise. [from a review of Children's book in The Quarterly Review of Science, Literature, and the Arts, vol. xiii, 1822]
isonomia (n.)

"equality before the law," c. 1600, from Italian or Latin, ultimately from Greek isonomia "equality of rights, the equality of a Greek democracy," from isos "equal, identical" (see iso-) + nomos "law" (see -nomy). Related: Isonomic (1851), which appears to be a separate formation in geology. Greek also had isoteleia in reference to an equality before the law sometimes granted to aliens in Athens, "equality of tax and tribute."

isopod (n.)
"animal with legs equal in size and position," 1835, from French isopode, from Latin isopoda (neuter plural), from Greek iso- "equal, identical" (see iso-) + pod-, stem of pous "foot" (from PIE root *ped- "foot").
isopolity (n.)
"equality of citizenship rights between different states," 1827, in reference to ancient Rome, from iso- "equal, identical" + polity.
isosceles (adj.)

"having two equal sides," 1550s, from Late Latin isosceles, from Greek isoskeles "with equal legs; isosceles; that can be divided into two equal parts," from isos "equal, identical" (see iso-) + skelos "leg," from PIE *skel-es-, from root *skel- "bend, curve" (see scoliosis).

isostasy (n.)
"equilibrium from equality of pressure," 1889 (C.E. Dutton), from iso- + Greek stasis "setting, weighing, standing" (see stasis). Greek isostasios meant "in equipoise with, equivalent to."

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