BT BM 67b(3)↗האי משכנתא באתרא דמסלקי לא ניכול אלא בנכיתאhˀy mškntˀ bˀtrˀ dmslqy lˀ nykwl ˀlˀ bnkytˀܗܐܝ ܡܫܟܢܬܐ ܒܐܬܪܐ ܕܡܣܠܩܝ ܠܐ ܢܝܟܘܠ ܐܠܐ ܒܢܟܝܬܐܗܐܝ ܡܫܟܢܬܐ ܒܐܬܪܐ ܕܡܣܠܩܝ ܠܐ ܢܝܟܘܠ ܐܠܐ ܒܢܟܝܬܐhˀy mškntˀ bˀtrˀ dmslqy lˀ nykwl ˀlˀ bnkytˀהאי משכנתא באתרא דמסלקי לא ניכול אלא בנכיתאܗܐܝ ܡܫܟܢܬܐ ܒܐܬܪܐ ܕܡܣܠܩܝ ܠܐ ܢܝܟܘܠ ܐܠܐ ܒܢܟܝܬܐܗܐܝ ܡܫܟܢܬܐ ܒܐܬܪܐ ܕܡܣܠܩܝ ܠܐ ܢܝܟܘܠ ܐܠܐ ܒܢܟܝܬܐ: concerning mortgaged property, in a place where they remove (the creditor immediately from its possession on payment of the debt), he should enjoy the usufruct (of the field) only against a deduction (from the annual debt)
DJBA derives this from nky, which comports with Geonic vocalizations; but an ultimate derivation from nkt 'to discount capital' seems equally possible if not preferable.
Page refs. in other dictionaries: DJBA: 754aJastrow: 910