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| Subject | English | Hungarian |
| life.sc., fish.farm. | blue jack mackerel | kék fattyúmakréla (Trachurus picturatus) |
| life.sc., fish.farm. | Chilean jack mackerel | chilei fattyúmakréla (Trachurus murphyi) |
| fish.farm. | jack and horse mackerels | fattyúmakrélák (Trachurus spp.) |
| tech. | jack-plane | hántógyalu |
| tech. | jack-plane | nagyológyalu |
| zool. | jack snipe | kis sárszalonka |
| transp., nautic. | jack-up vessel | emelő hajó |
| agric. | lifting jack | kocsiemelő |
| agric. | lifting jack | örlő |
| comp., MS | Registered Jack-45 connector | RJ-45-ös csatlakozó (An eight-wire connector used to attach devices to cables. The eight wires are encased in a plastic sheath and color-coded to match corresponding slots in jacks and are used to connect computers to LANs (local area networks) and to link ISDN (Integrated Services Digital Network) devices to NT-1 (Network Terminator 1) devices) |
| agric. | screw jack | kocsiemelő |
| agric. | screw jack | örlő |