| the typical ending of the first element of compounds of Greek origin (as -i- is, in compounds of Latin origin), used regularly in forming new compounds with elements of Greek origin and often used in English as a connective irrespective of etymology: Franco-Italian; geography; seriocomic; speedometer. |
| -o- Used as a connective to join word elements: acidophilic. [Middle English, from Old French, from Latin, from Greek, thematic vowel of nouns and adjectives used in combination.] |
-o-
Used as a connective to join word elements: acidophilic.
