A lekythion or lecythion, in classical Greek and Latin poetry, is a metric pattern defined by a sequence of seven alternating long and short syllables at the end of a verse. In classical grammatical terminology it can be described as a trochaicdimetercatalectic, i.e. a combination of two groups of two trochees each, with the second of these groups lacking its final syllable; or as a trochaic hepthemimer, i.e. a trochaic sequence of seven half-feet. A lekythion can appear in several different metric contexts in different types of poetry, either alone as a verse or as the second of two cola following a caesura. A frequenttype of occurrence in Greek drama is in lines of iambic trimeter, the most frequent metre used in spoken dialogue, i.e. lines of the type ⊻—∨—|⊻—∨—|⊻—∨—. These lines may have a metric caesura after the first five syllables, with the remaining line thus resulting in a lekythion group.
The term "lēkythion" literally means "small oil-flask". The term was coined in reference to a passage in the comedyThe Frogs by Aristophanes, in which the two poets Aeschylus and Euripides are engaged in a comic debate criticizing each other's works. Aeschylus makes Euripides recite the beginnings of several of his tragic prologues, each time interrupting him and interjecting the same phrase "... lost his little oil flask", wherever the verse offers an opportunity, which is frequently the case because of Euripides' propensity to use a metric caesura after the first five syllables. Below, as an example, is one of the original passages of Euripides, followed by the same passage as parodied in The Frogs. In both cases, the metric lēkythion part is highlighted in green; metric foot boundaries are marked with "|" and metric caesuras with "¦".
As a technical term in metrical analysis, the term "lekythion" is first attested in the 2nd century AD, in the Handbook of Metrics by the grammarian Hephaestion. Hephaestion also calls the pattern the "Euripideum". While Hephaestion does not explicitly refer to the passage in The Frogs, he cites some other verses from Euripides as an example. Here, the lekythion is found alone as a full line, in a piece of choral lyrics from the tragedy Phoenissae.