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Noun: metamerism  mu'ta-mu,ri-zum
  1. (chemistry) the phenomenon where compounds have the same molecular formula but different structural formulas
    "Metamerism explains why butane and isobutane have different properties despite having the same formula"
     
  2. (biology) the state of being composed of a series of similar body segments or metameres
    "Metamerism is clearly visible in the segmented body of an earthworm"

Derived forms: metamerisms

Encyclopedia: Metamerism