Definition of rucksack

< ruck

ruckus >

ruck·sack    (rksk, rk-) KEY 

NOUN:

A knapsack.

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ETYMOLOGY:
German : dialectal Ruck, back (from Middle High German rück, ruck, from Old High German hrukki; see sker-² in Indo-European roots) + Sack, sack (from Middle High German sac, from Old High German, from Latin saccus; see sack¹)