Webster's English Dictionary

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symmetrical

sym.met.ri.cal or sym.met.ric \s*-'me-tri-k*l\ \-trik\ \-tri-k(*-)le-\ 
   \-k*l-n*s\ aj 1: having, involving, or exhibiting symmetry  2: having 
   corresponding points whose connecting lines are bisected by a gi ven point 
   or perpendicularly bisected by a given line or plane {~ curves} 3: being 
   such that the terms may be interchanged without altering the valu e, 
   character, or truth {~ equations} 4a: capable of division by a longitudinal 
   plane into similar halves {@ plant parts} 4b: having the same number of 
   members in each whorl of floral leaves {R@ flowers} 5: affecting 
   corresponding parts simultaneously and similarly {~ r ash} 6: exhibiting 
   symmetry in a structural formula; esp : being a deri vative with groups 
   substituted symmetrically in the molecule - sym.met.ri.cal.ly av