An amentum (Greek: αγκύλη, ankyle,) was a leather strap attached to a javelin used in ancient Greek athletics, hunting, and warfare, which helped to increase the range and the stability of the javelin in flight. Stability in flight was important because it allowed the javelin to land on its point, which was the only way the throw could be accurately recorded in competition or be useful against a live target. An amentum also increased the effective length of the throwing arm similarly to a spear-thrower or Swiss arrow, which enhances the speed of the projectile.
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Amentum in the context of Javelin
A javelin is a light spear designed primarily to be thrown, historically as a ranged weapon. Today, the javelin is predominantly used for sporting purposes such as the javelin throw. The javelin is nearly always thrown by hand, unlike the sling, bow, and crossbow, which launch projectiles with the aid of a hand-held mechanism. However, devices do exist to assist the javelin thrower in achieving greater distances, such as spear-throwers or the amentum.
A warrior or soldier armed primarily with one or more javelins is a javelineer.
Amentum in the context of Lancea (weapon)
The lancea was a javelin used in ancient Rome. According to the Oxford English Dictionary, the word originally came from the Celtiberian language, also cf. λόγχη (lonche), the Greek term for lance. One kind of lancea, possibly known as the lancea pugnatoria or "the fighting lance" was used as a thrusting weapon by cavalrymen. This weapon was used by cavalrymen as it was lighter and easier to use than the pilum. The lancea was also used by auxiliaries. Legionaries would use the lancea if the occasion called for it. Arrian equipped his army with the weapon during a battle with the Alans. Soldiers that used it were known as lancearii. It is unclear how the lancea was distinguished from the hastae. Many lancea had amenta, although not all. This kind of javelin also had short wooden shafts and small leaf-shaped metal heads. Sometimes the heads had elongated points which may have been used to increase the penetration of the spear.