hydrophobic fragmental constant

https://doi.org/10.1351/goldbook.12668
Representation of the lipophilicity contribution of a constituent part of a structure to the total lipophilicity.
Source:
PAC, 2013, 85, 1725. (Glossary of terms used in medicinal chemistry. Part II (IUPAC Recommendations 2013)) on page 1737 [Terms] [Paper]