GNU Collaborative International Dictionary of English

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1.       
   Coamings , n. pl. [Cf. Comb a crest.] (Naut.) Raised pieces of wood of iron around a hatchway, skylight, or other opening in the deck, to prevent water from running bellow; esp. the fore-and-aft pieces of a hatchway frame as distinguished from the transverse head ledges. [Written also combings.]
   1913 Webster