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“marigraph”
An instrument for automatically recording the rise and fall of the tide; a tide gage: Mr. Thompson used a special device called a marigraph to show his students how the tide levels changed during their excursion to the ocean.
This entry is located in the following units:
grapho-, graph-, -graph, -graphy, -grapher, -graphia
(page 53)
mare, mari-, mar- +
(page 2)