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marigram

American  
[mar-i-gram] / ˈmær ɪˌgræm /

noun

  1. a graphic representation from a marigraph.


marigram British  
/ ˈmærɪˌɡræm /

noun

  1. a graphic record of the tide levels at a particular coastal station

"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

Etymology

Origin of marigram

< Latin mari- (combining form of mare sea) + -gram 1