A monolithic IC is a type of "integrated circuit" electronic device (commonly referred to as a "chip") that contains active and passive devices (transistors, diodes, resistors, capacitors) that are made in and on the surface of a single piece of a single crystal semiconductor, such as a Silicon (Si) wafer. A process called "planar technology" must be used in the single block (monolith), and be interconnected to the insulating layer over the same body of the semiconductor to produce a solid integral monolithic-IC.
If the devices are interconnected by bonding wires dangling above the chip, is not a monolithic-IC; it is a hybrid-IC.
In monolithic-ICs, the devices (transistors, diodes, resistors and capacitors) are fabricated on the same single chip of a single Silicon crystal by PLANAR technology, and have ISOLATED p-n junctions, and have interconnections adherent to the insulator layers without shorting to the adjacent areas and each other.