Wikipedia
Seax (; also sax, sæx, sex, latinized sachsum) is an Old English word for " knife". In modern archaeology, the term seax is used specifically for a type of sword or dagger typical of the Germanic peoples of the Migration period and the Early Middle Ages, especially the Saxons, whose name derives from the weapon.
In heraldry, the seax is a charge consisting of a curved sword with a notched blade, appearing, for example, in the coats of arms of Essex and the former Middlesex.
Old English seax, sax and Old Frisian sax are identical with Old Saxon and Old High German saks, all from a Common Germanic *sahsą from a root *sah, *sag- "to cut" (also in saw, from a PIE root *sek-). In Scandinavia, the words sax, saks or sakset all refer to scissors, which of course are used for cutting various materials. The term scramaseax or scramsax (lit. "wounding-knife") is sometimes used for disambiguation, even though it is not attested in Old English, but taken from an occurrence of scramasaxi in Gregory of Tours' History of the Franks.
The name of the roofer's tool, the zax, is a development from this word.
Usage examples of "seax".
I murmured, the reality of the decidedly unreal situation being driven home by the cold weight of the seax in my hand.
Slowly the man let his sword fall to the ground and dropped his belted seax beside it, turning his hands palm upward and open to show his surrender.
Wulfgar bent and picked up the seax from the floor beside her and turned it over in his hand examining it closely.
With an oath he flung the seax at the offending portal where it clattered on the wood and then on the floor.
Against her side, beneath her cloak, she could feel the leather sheath of the seax and wondered if she would have the courage and swiftness to use it.