## Mare
**mare** (*n.*) — a female horse, especially one that is fully grown.
### Old English and Germanic Forms
The Old English form is **miere** or **myre**, denoting a female horse. It descends from Proto-Germanic **\*marhijō**, the feminized derivative of **\*marhaz**, which meant simply *horse*. This masculine form survives in Old English as **mearh** (a horse, a steed), in Old High German as **marah**, and in Old Saxon as **marah**.
The Proto-Germanic root derives from PIE **\*marko-**, a word for *horse* shared across several IE branches. This makes *mare* one of the most culturally significant words in comparative linguistics: the IE vocabulary for horses is direct evidence of the horse-domestication complex that characterizes the early IE speech community.
The Celtic branch preserves this root with clarity. Old Irish **marc** (a horse) and Welsh **march** (a stallion) are the primary attestations. The legendary King Mark of Cornwall — *March ap Meirchion* in the Welsh tradition — bears a name that simply means *Horse*, a fitting kingly epithet in a culture that measured wealth in horseflesh.
### The Marshal: Horse-Servant
The most remarkable derivative of Proto-Germanic **\*marhaz** is a military title. The compound **\*marhaz + \*skalkaz** — *horse-servant*, a stable groom — yielded Frankish **\*maraskalk**, which passed into Medieval Latin as *marascalcus* and into Old French as **maréchal**. The maréchal began as a royal groom; as the man responsible for the king's horses, he managed cavalry logistics. By administrative expansion, the marshal became responsible for military organization, then for supreme field command. English
German followed a parallel path but with different results for the base word: Modern German **Mähre** retains *\*marhijō* but now connotes an old, worn-out horse — a nag. The elevation of status went to *Marschall* while the common horse-word descended.
One of the most persistent etymological confusions in English surrounds the word **nightmare**. The *mare* in *nightmare* is not a female horse. It is an entirely separate word: Old English **mara**, a supernatural being that was believed to sit on a sleeping person's chest, pressing the breath out and causing suffocation, paralysis, and terror. The *mara* belongs to a Germanic family of evil spirits
### Survival and Use
English *mare* has remained the standard word for an adult female horse without interruption from Old English to the present. The philological significance reaches beyond its equine reference. The presence of *\*marko-* across Celtic and Germanic is testimony to a shared pre-migration vocabulary, a lexical fossil of the steppe world from which the Indo-European languages spread.