| Subject | English | Italian |
| transp., mech.eng. | alternating piston engine | motore alternativo a pistoni |
| mech.eng. | axial piston engine | motore a cilindro assiale |
| industr. | compression-ignition internal combustion piston engine | motore a pistone con accensione per compressione |
| mech.eng. | engine with opposite pistons | motore a pistoni contrapposti |
| mech.eng. | free piston engine | motore a pistoni liberi |
| econ., transp., mech.eng. | free-piston engines | motore a pistoni liberi |
| mech.eng. | internal combustion piston engine | motore a scoppio a pistoni |
| transp., mech.eng. | internal combustion piston engine | motore a combustione interna a pistoni |
| transp., avia. | multiple piston-engined aeroplane | aeroplano plurimotore a pistoni |
| mech.eng. | opposed piston engine | motore con cilindri orizzontali contrapposti |
| mech.eng. | opposed piston engine | motore a pistoni opposti |
| transp. | piston engine | motore a pistone |
| chem. | piston engine | motore a cilindro |
| mech.eng. | piston steam engine | macchina a vapore a pistone |
| gen. | pistons for engines | pistoni di motori |
| transp., mech.eng. | reciprocating piston engine | motore a pistone alternativo |
| transp., mech.eng. | reciprocating piston engine | motore alternativo |
| transp., industr. | rotary internal combustion piston engine | motore a pistone rotativo |
| transp., industr. | rotary internal combustion piston engine | motore a pistone rotativo con accensione a scintilla |
| transp., industr. | rotary piston engine | motore a combustione rotativa |
| transp., industr. | rotary piston engine | motore a pistone rotativo |
| transp., industr. | rotary piston engine | motore rotativo |
| mech.eng. | rotary piston engine | motore a pistone rotante |
| transp., industr. | rotary piston engine | motore rotante |
| transp., mech.eng. | rotary piston engine | motore a pistoni rotanti |
| transp., mech.eng. | rotating piston engine | motore rotativo |
| transp., industr. | rotating piston engine | motore a pistone rotativo |
| transp., mech.eng. | rotating piston engine | motore rotante |
| transp., mech.eng. | rotating piston engine | motore a pistone rotante |
| transp., mech.eng. | rotating piston engine | motore a combustione rotativa |
| transp., avia. | single piston engine | monomotore a cilindri |
| transp., avia. | single piston-engined aeroplane | aeroplano con motore singolo a pistoni |
| transp., industr. | spark-ignition internal combustion piston engine | motore a pistone con accensione a scintilla |
| transp., industr. | spark-ignition reciprocating internal combustion piston engine | motore a pistone alternativo con accensione a scintilla |
| transp., industr. | spark-ignition reciprocating piston engine | motore a pistone alternativo con accensione a scintilla |
| transp., industr. | spark-ignition rotary internal combustion piston engine | motore a pistone rotativo con accensione a scintilla |