Located on this side of the sea or ocean; on the same side of the sea as the speaker.
From Latin 'cis-' (on this side) plus 'marine' (relating to the sea). This rare geographical term follows the standard pattern of Latin directional prefixes used in historical and political geography.
While hardly used today, this word reveals how Europeans obsessed over dividing the world by seas—'cismarine' literally means 'our side of the ocean' in a world where water was the primary barrier between civilizations.
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