(historical) A sword seen as a being a part of someone's set of arms or military accoutrements; a warrior's regimental or official sword.

plural of Whirling Dervish

(medicine) the hypothesis that there exists a time gradient in retrograde amnesia, where recent memories are more likely to be lost than more remote ones

(historical) A form of land taxation that replaced Danegeld in twelfth-century England. / (obsolete) The act of ploughing.