Webster's English Dictionary

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isotonic

iso.ton.ic \.i--s*-'ta:n-ik\ \-i-k(*-)le-\ \.i--s*-to--'nis-*t-e-\ aj [ISV] 
   1: of, relating to, or exhibiting equal tension  2: ISOSMOTIC - used of 
   solutions  - iso.ton.i.cal.ly av