-o-

Etymology 1
Adopted from, originating ultimately from and. In English, the connective is found from the Middle English period in direct borrowings from Latin. Direct formations of English terms with the connective, always combining Greek or Latin roots, appear from the 16th or 17th century. From the 18th century, the suffix becomes productive in compounds where the second element is English. From about 1800, formations on all sorts of stems become common.

Translations

 * Irish: -a-
 * Kashubian: -o-
 * Polish:
 * Portuguese: -o-, -ó- , -ô-

Etymology 2
Designated in the USAN guidelines for non-proprietary names of monoclonal antibodies.

Affix

 * 1)  a monoclonal antibody derived from a murine source

Related terms

 * is the base suffix common to all monoclonal antibodies. (See that entry for full paradigm.)

Etymology
, from.

Interfix

 * 1) -o-

Interfix

 * 1) A suffix-initial vowel (or linking vowel) inserted interconsonantally between the word stem and the suffix, to ease pronunciation, without contributing to the meaning.

Etymology
. Compare 🇨🇬

Etymology
Adopted from the thematic vowel in and, often used to form nominal compounds. In Ancient Greek, the connective suffix originates in compounds where the first member is thematic, such as, but was extended by analogy to other stems, such as. The suffix was borrowed as a connective into Latin, mainly in compounds of Greek origin.

The suffix becomes productive and forms new compounds in learned humanist Latin, from the Renaissance. The connective is especially productive in connecting ethnonyms or geographical terms; genuine Greek stems include Gallo-, and Syro-, but most are of medieval or modern origin, productive from the 15th century, such as Anglo-, Graeco- or Latino-.

Interfix

 * 1)   (such as, from  and ).

Etymology
.

Interfix

 * kiš + + -bran →
 * kiš + + -bran →

Etymology
From, , from the Old Swedish genitive form of Germanic feminine ōn-stems.

Alternates with according to Old Swedish rules of, where -o was used after heavy syllables and -u after light.

Usage notes

 * Used as interfix in compounds with certain old weak feminines ending in -a. Some common ones are, e.g. ; , e.g. ; , e.g. ; , e.g. ; , e.g. ; , e.g. ; , e.g. ; , e.g. ; , e.g. , etc.
 * Alternates with a zero interfix (vowel deletion) in some words, cf., but ; , but.
 * The interfix was formerly mostly confined to the written literary language, whereas the spoken colloquial language preferred compounds with no -o- or with -e- in some dialects, but forms with -o- are now common in the spoken language, and formerly colloquial pronunciations such as körrgård for are today less common.

Etymology
.