homo

1. An acronym for Highest Occupied Molecular Orbital (HOMO).
   See: frontier orbitals
2. A prefix (consisting of lower case letters, homo), used to indicate a higher homologue of a compound.
   Source:
   PAC, 1994, 66, 1077 (Glossary of terms used in physical organic chemistry (IUPAC Recommendations 1994)) on page 1121
3. homo- Affix used to denote a ring expansion by inclusion of a methylene group into a ring-sector.