Of Latin origin (libra); a pound in weight -- pound.
Thayer's Greek Lexicon
Strong's 3046: λίτρα
λίτρα, λίτρας, ἡ, a pound, a weight of twelve ounces: John 12:3; John 19:39. (Polybius 22, 26, 19; Diodorus 14,116, 7; Plutarch, Tib. et G. Grac. 2, 3; Josephus, Antiquities 14, 7, 1; others.)
John 12:3 - N-AFS GRK:Μαριὰμ λαβοῦσα λίτραν μύρου νάρδου NAS: took a pound of very costly KJV: Mary a pound of ointment INT: Mary having taken a litra of ointment of nard
John 19:39 - N-AFP GRK:ἀλόης ὡς λίτρας ἑκατόν NAS: about a hundred pounds [weight]. KJV: about an hundred pound [weight]. INT: aloes about litras a hundred