geocline
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geocline — ge·o·cline … English syllables
geocline — ˈjēōˌklīn noun Etymology: ge + cline : the gradation in variation of any widespread polytypic group of organisms along geographical lines compare allen s rule, bergmann s rule … Useful english dictionary
cline — n. [Gr. klinein, to slope] A change in population characteristics over a geographical area, usually related to a corresponding environmental change; geocline … Dictionary of invertebrate zoology