One who has taken an oath; specifically, a Mohammedan Malay or Moro who has sworn to die in killing as many persons, especially Christians or enemies, as he can.(noun)
The Century Dictionary (Public Domain)
Use "juramentado" in a sentence
"Piang's big, black eyes filled with mystery when he described how the juramentado rides to the abode of the blessed on a shadowy, white horse, taller than a carabao, just as dusk is falling."
"Nervously the men wandered about; the two wounded men became the center of attraction and related for the hundredth time their sensations when the juramentado had struck them down."
"That night as the Americans swung along under the dome of brilliant stars, a question arose as to the meaning of juramentado."