The term that denotes the true soil above the zone of partly weathered bedrock is solum.

Here's why:

* Solum: This is the upper, most weathered part of the soil profile, where the majority of biological activity takes place. It includes the A, E, and B horizons.

* Zone of partly weathered bedrock: This refers to the C horizon, which is made up of partially broken down rock material. It lies directly below the solum.

So, the solum represents the true soil, while the C horizon represents the transition zone between soil and the parent rock.