Webster's English Dictionary

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shrill

1. shrill \'shril, esp South 'sril\ vb [ME shrillen] : to utter or emit an 
   acute, piercing sound  : SCREAM 
2. shrill \'s(h)ril-le-\ aj 1a: having or emitting a sharp high-pitched 
   tone or sound : PIERCING)M 1b: accompanied by sharp high-pitched sounds or 
   cries  2: having a sharp or vivid effect on the senses {~ light}  3: 
   INTEMPERATE, EXTRAVAGANT {~ anger}  - shrill av
3. shrill n : a shrill sound