-u-

Etymology
From the initial vowel of.

Infix

 * 1)  a monoclonal antibody derived from a human source.

Related terms

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

Infix

 * 1) it,

Etymology
In almost all words 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 some old weak feminines with a former light syllable ending in -a. Some common ones are, e.g. ; , e.g. , etc.
 * Alternates with a zero interfix (vowel deletion) in some words, cf., but.
 * The interfix was formerly mostly confined to the written literary language, whereas the spoken colloquial language preferred compounds with no -u- or with in some dialects, cf. dated  with modern, and the common pronunciation  for . However, for some words, -u- is common in compounds even in the modern spoken language.