Webster's English Dictionary

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chronometer

chro.nom.e.ter or chro.no.met.ri.cal \kr*-'na:m-*t-*r\ \.kra:n-*-'me-trik, 
   .kro--n*-\ \-tri-k*l\ \-k(*-)le-\ n : an instrument for measuring time : 
   TIMEPIECE; esp : one  intended to keep time with great accuracy - 
   chro.no.met.ri.c aj