Webster's English Dictionary

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laxative

1. lax.a.tive \'lak-s*t-iv\ aj [ME laxatif, fr. ML laxativus, fr. L 
   laxatus, pp. of laxar]e to loosen, fr. laxus 1: having a tendency to loosen 
   or relax; specif : relieving consti pation 2: having loose bowels  3: 
   LOOSE, UNRESTRAINED {a ~ tongue}  - lax.a.tive.ly av
2. laxative n : a usu. mild laxative drug