a graphic representation from a marigraph.
Origin of marigram
< Latin mari- (combining form of mare sea) + -gram1
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a graphic record of the tide levels at a particular coastal station
Word Origin for marigram
from Latin mare sea + -gram
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012