| Subject | English | Russian |
| dentist. | new dentin formed in response to stimuli associated with the normal aging process or with pathological conditions such as caries or injury, or cavity preparation: such dentin is highly irregular in nature | иррегулярный дентин (– according to Dorland; – secondary dentin according to Dorland MichaelBurov) |
| dentist. | new dentin formed in response to stimuli associated with the normal aging process or with pathological conditions such as caries or injury, or cavity preparation: such dentin is highly irregular in nature | вторичный дентин (– according to Dorland; – secondary dentin according to Dorland MichaelBurov) |
| energ.ind. | normal aging | естественное старение |
| tech. | normal aging | естественный износ (оборудования Rowan) |