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tank farm
tank farming
tank locomotive
tank suit
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tank trap
tank up
tank wagon
tanka (1)
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tannin

tan·nin [ tánnin ] (plural tan·nins)


noun 
Definition:
 
plant chemical used in tanning: a brownish or yellowish compound found in plants. Use: tanning, dyes, astringents.

[Early 19th century. < French tanin< tan "tanbark" < medieval Latin tannum]
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