herbicide herbicide /ˈɝːbɪˌsaɪd/

noun

1. A chemical agent that destroys plants or inhibits their growth  ( herbicide , weed killer , weedkiller )
   a chemical agent that destroys plants or inhibits their growth
    I try to avoid using weed killer in my garden, but sometimes I have to resort to it for tough weeds like thistle
   I try to avoid using weed killer in my garden, but sometimes I have to resort to it for tough weeds like thistle