The Bibliotheca Teubneriana, or Teubner editions of Greek and Latin texts, comprise the most thorough modern collection ever published of ancient (and some medieval) Greco-Roman literature. The series, whose full name is the Bibliotheca Scriptorum Graecorum et Romanorum Teubneriana, consists of critical editions by leading scholars (now always with a full critical apparatus on each page, although during the nineteenth century some editiones minores were published either without critical apparatuses or with abbreviated textual appendices).
Teubneriana is an abbreviation used to denote mainly a single volume of the series (fully: editio Teubneriana), rarely the whole collection; correspondingly, Oxoniensis is used with reference to the Scriptorum Classicorum Bibliotheca Oxoniensis, mentioned above as Oxford Classical Texts.
Today, the only comparable publishing ventures, producing authoritative scholarly reference editions of numerous ancient authors, are the Oxford Classical Texts and the Collection Budé (whose volumes also include facing-page French translations with notes). (The Loeb Classical Library, with facing-page English translations and notes, aims at a more general audience.)
Read more about Bibliotheca Teubneriana: History of The Series, Greek Type in Teubner Editions