Webster's English Dictionary

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demulcent

1. de.mul.cent \di-'m*l-s*nt\ aj [L demulcent-, demulcens, prp. or 
   demulce-re to soothe, fr]. de- + mulce-re to soothe : SOOTHING 
2. demulcent n : a usu. mucilaginous or oily substance (as tragacanth) 
   capable of soothin g or protecting an abraded mucous membrane