ˈparəˌkȯ(ə)r noun
( -s )
Etymology: para- (I) + Greek chōros space; from its indicating volume — more at chor-
: an empirical constant for a liquid that relates the surface tension to the molecular volume and that may be used for a comparison of molecular volumes under conditions such that the liquids have the same surface tension and for determinations of partial structure of compounds by adding values obtained for constituent atoms and structural features — called also molar parachor, molecular parachor