nin·ja 
(nĭnjə)
(nĭnjə)n. pl. ninja or nin·jas
A member of a class of medieval Japanese mercenary agents who were trained in the martial arts and hired for covert operations such as assassination and sabotage.
[Japanese : nin, to endure (from Early Middle Chinese ᶮin'; also the source of Mandarin rěn) + sha, person (from Middle Chinese tʂia´, pronoun for head of a relative clause; also the source of Mandarin zhě).]
- Indo-European root: pō(i)-
- Indo-European root: pū̆-
- Indo-European root: pəter-
- Indo-European root: re-
- Indo-European root: reg-
- Indo-European root: rei-
- Indo-European root: reidh-
- Indo-European root: reig-
- Indo-European root: rep-
- Indo-European root: ret-
- Indo-European root: reudh-
- Indo-European root: reug-
- Indo-European root: reup-
- Indo-European root: reuə-
- Indo-European root: rē-
- Indo-European root: rēd-
- Indo-European root: r̥tko-
- Indo-European root: sak-
- Indo-European root: sal-
- Indo-European root: sed-
- Indo-European root: segh-
- Indo-European root: sek-
- Indo-European root: sekw-
- Indo-European root: sekw-
- Indo-European root: sekw-