Relating to the region on the southern side of the Ganges River (as opposed to transgangetic, meaning north of it).
From Latin cis- (on this side of) and gangetic (relating to the Ganges River). The prefix cis- contrasts with trans- (across or beyond).
The term cisgangetic reveals how colonial mapmakers divided India by rivers, and this geographical terminology accidentally created the prefix 'cis-' that now applies to chemistry and gender identity—words inherit their meanings in surprising ways.
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