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From Biology-Online Dictionary
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1. To make defective; to do injury to, especially. By cutting Off or defacing a part; to impair; to disfigure; to deface. I pray you mar no more trees with wiring love songs in their barks. (Shak) But mirth is marred, and the good cheer is lost. (Dryden) Ire, envy, and despair Which marred all his borrowed visage. (Milton)

2. To spoil; to ruin. It makes us, or it mars us. Striving to mend, to mar the subject.

Origin: oe. Marren, merren, as. Merran, myrran (in comp), to obstruct, impede, dissipate; akin to os. Merrian, OHG. Marrjan, merran; cf. D. Marren, meeren, to moor a ship, Icel. Merja to bruise, crush, and goth. Marzjan to offend. Cf. Moor.