malenoidadj.
/ˈmalənɔɪd/, U.S. /ˈmælənɔɪd/ Chemistry.
Resembling maleic acid in having a cis configuration in geometrical (cis-trans) isomerism. Cf. fumaroid adj.
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the world > matter > chemistry > organic chemistry > organic acids > [adjective] > carboxylic acids > miscellaneous others
uramilic acid1839
thioformic1857
phthalic1869
hexonic1894
fumaroid1895
malenoid1895
trigenic1941
1895 J. M. Thomson & A. G. Bloxam Bloxam's Chem. (ed. 8) 595 Many cases of stereoisomerism are believed to be explicable by formulæ resembling those given above, so that the expressions maleinoid and fumaroid structure are used.
1907 J. B. Cohen Org. Chem. Adv. Students I. 110 It exhibits lateral symmetry, and is known as the plane-symmetric, or, more commonly, as the cis or malenoid form.
1938 A. J. Mee tr. P. Karrer Org. Chem. xvii. 256 It thus became common to call cis-ethylenic compounds, malenoid, and trans-ethylenic derivatives, fumaroid forms.
1964 Internat. Encycl. Chem. Sci. 709/2 Malenoid form, the cis form of geometrical isomerism.
This entry has been updated (OED Third Edition, June 2000; most recently modified version published online March 2022).
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