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intromolecular
intromolecular adj. 
/ˌɪntroʊməˈlɛkjələr/ subsisting within a molecule, or between its constituent atoms (distinguished from intermolecular).
Brit. /ˌɪntrə(ʊ)məˈlɛkjᵿlə/
, /ˌɪntrə(ʊ)məˈlɛkjᵿlə/U.S. /ˌɪntrəməˈlɛkjələr/
, /ˌɪntrəməˈlɛkjələr//ˌɪntroʊməˈlɛkjələr/Π
1895 N. Story-Maskelyne Crystallogr. vi. §152 Not merely the relative distribution inter se—the intermolecular distribution—of the chemical molecules.., but also the intromolecular arrangement of the atoms, whereof the molecules are composed.
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