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Definitions of oker:
noun: (now chiefly dialectal) Interest on money; usury; increase.
verb: (transitive, now chiefly dialectal) To increase (in price); add to.
noun: (mineralogy) Obsolete form of ochre. [An earth pigment containing silica, aluminum and ferric oxide]
noun: Alternative form of oka (“unit of measurement”) [(historical) A former Turkish, Egyptian, Hungarian, and Romanian unit of weight, usually of a little more than a kilogram.]