-ole 1
a suffix found in French loanwords of Latin origin, usually diminutives, and later in adaptations of words borrowed directly from Latin or in Neo-Latin coinages: areole; centriole; vacuole.
[ -olus, -ola, -olum, var. of -ulus -ULE with stems ending in a vowel ]
-ole 2
a suffix used in names of chemical compounds, esp. five-membered, unsaturated rings ( carbazole; indole; thiazole ) and, less systematically, aromatic ethers ( anisole; safrole ). Also, -ol 2 .
[ oleum OIL ]