| NOTGATE | Logic circuit used in computers also known as an inverter |
| ONES | With nothing they are used in computers (4) |
| BINARYSYSTEM | It's used in computers, and in solving 20-, 34- and 43-Across |
| ADDER | Circuit used in arithmetic logic units in computers |
| SIM | Small card carrying an integrated circuit used in mobile phones (3) |
| LAP | Circuit used in electrical appliances (3) |
| CRYSTALBALL | Object used in fortune telling also known as an orbuculum (7,4) |
| AND | It is also a logic circuit (3) |
| MONADNOCK | Isolated hill of hard rock in an otherwise eroded area, also known as an inselberg (9) |
| APSE | Recess in church design also known as an exedra (4) |
| OVOLO | In architecture, is a convex moulding also known as an echinus |
| SCORPION | Siege engine used by ancient Roman armies, also known as an onager (8) |
| EYESOCKET | Cavity in the face also known as an orbital (3,6) |
| RACETRACK | A circuit used for motor racing (4,5) |
| IMOLA | Formula 1 motor racing circuit used for the San Marino Grand Prix (5) |
| LATCH | Simple electronic logic circuit whose output state, in the form of 1 bit of data, is retained until updated by a new input signal (5) |
| INFLATOR | She'd puff up because of plain logic circuit |
| RAMSGATE | Resort results from computer memory's logic circuit |
| NOR | Number provided by computer's last logic circuit |
| MIDWIFE | Title of a female professional also known as an accoucheuse, depicted in a memoir by nurse Jennifer |
