Ancient Greek one-handled, usually tall and slender narrow-necked vessels used for oil and unguents and as an offering for the dead. The form resembles the aryballos in that it has a narrow neck and a single handle, but the lekythos is generally a taller vessel with a small, deep mouth. The Greek word lekythos was undoubtedly used for the various forms called "lekythos" today, although it also appears that the term was used for oil vessels in general in Ancient times.

Source: Art & Architecture Thesaurus

http://vocab.getty.edu/page/aat/300264937