Sakota- Here is a link to a great explanation to your question. It also show a picture of ground glass.
https://pulmccm.org/review-articles/management-ground-glass-subsolid-pulmonary-nodules-review/
I don't want this to sound like a lecture, but here goes- Research brings knowledge that brings understanding that reduces worry. When we know the meaning of words we gain power over their implications and the decisions that need to be made. Often, as you know, radiologists pick up more things on CT scans than surgeons or oncologists. I always ask if a doctor has actually looked at the scan. If they haven't I ask that they do.
What does the radiology report say about the comparison to the scan just before this one?
subsolid morphology suggesting multicentric synchronous indolent primary lung cancers- actually means that there are more than one primary, indolent (not moving or growing slowly or inactive) half solid/half ground glass lesions. If these were on your previous scans than they haven't grown. Call your doctor and have him. explain.

Sakota-my radiology reports can sound downright frightening. I believe the radiologist report absolutely everything they see. In our case, that may or may not come to fruition 6 months from now. I give myself a few days if needed to be upset and put it on the shelf (if you can) until 6 months from now. There is absolutely nothing we can do about it so I try to not give it too much of my energy.