An alternative adjective form meaning bicyclic; having two cycles or rings, especially in chemical structures.
From bicyclic + -al (adjective suffix). A variant form of bicyclic that emphasizes the cyclic nature with the -al ending.
'Bicyclical' is rarer than 'bicyclic,' but both mean the same thing—chemistry terminology often has these synonym pairs where one form catches on more than the other based on usage patterns by the first researchers who published.
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