The term 'chemical ending' refers to the suffixes that are added to the end of chemical compounds to indicate their type. The crossword solutions for this term include OSE (3 letters), INE (3 letters), ARYL (4 letters), ITE (3 letters), ASE (3 letters), ENE (3 letters), ANE (3 letters), IDE (3 letters), YNE (3 letters), ENOL (4 letters), ITOL (4 letters), and OLIC (4 letters). These suffixes are used to indicate the type of compound, such as an alcohol (ENOL or ITOL) or an acid (OLIC). For example, the suffix -OSE indicates a sugar, while -INE indicates an alkaloid. Additionally, -ARYL is used to indicate an aromatic hydrocarbon, -ITE is used to indicate an ester, -ASE is used to indicate an enzyme, -ENE is used to indicate an alkene, -ANE is used to indicate an alkane, and -IDE is used to indicate an ionic compound. Finally, -YNE is used to indicate an alkyn.