An inkjet printhead chip includes a wafer substrate that defines a plurality of ink inlet channels. A drive circuitry layer is positioned on the wafer substrate. A plurality of nozzle assemblies is positioned on the wafer substrate. Each nozzle assembly includes a nozzle chamber structure that comprises a fixed portion that bounds a respective ink inlet channel and a movable portion. The fixed and movable portions define a nozzle chamber in fluid communication with the ink inlet channel. The movable portion defines an ink ejection port and is movable relative to the fixed portion so that ink is ejected from the ink ejection port. Peripheries of the fixed and movable portions are shaped and relatively positioned so that ink in the nozzle chamber establishes a meniscus between the peripheries that defines a fluidic seal to inhibit the egress of ink during operation. An actuator is connected to the drive circuitry layer to receive an electrical signal from the drive circuitry layer and is arranged to act on the movable portion to displace the movable portion with respect to the fixed portion on receipt of the electrical signal.