Definition of "marl"
noun:
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A mixed earthy substance, consisting of carbonate of lime, clay, and possibly sand, in very variable proportions, and accordingly designated as calcareous, clayey, or sandy.
from Wiktionary, Creative Commons Attribution/Share-Alike License
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verb:
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To cover, as part of a rope, with marline, marking a peculiar hitch at each turn to prevent unwinding.
from Wiktionary, Creative Commons Attribution/Share-Alike License
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