词根词缀：cultri-, cultr-

【来源及含义】Latin: knife

【同源单词】coulter, cultrate, cultriform, cultrirostral, cultrivorous

词根词缀：rigi-, rig-

【来源及含义】Latin: stiff, hard, numb; to be frozen, to grow stiff with cold, to be chilled

【同源单词】acid rigor, calcium rigor, catatonic rigidity, cerebellar rigidity, clasp-knife rigidity, cogwheel rigidity