ISOTOPY Meaning of ISOTOPY in English ˈ ̷ ̷ ̷ ̷ˌtōpē, īˈsäd.əpē noun( -es )Etymology: International Scientific Vocabulary isotope + -y, n. suffix: the quality or state of being isotopic Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012