If you mean circulating blood sugar, the medical term is glucose. But there are many types of "sugar" each with their own names, like sucrose, dextrose, etc.
The combining form for dermatologist is dermat/o.
The combining form for "gingivo-" is "gingiv/o-".
The combining form for potassium is kal/i.
-ologist is the combining form meaning specialist.
The combining form for sugar is "glyc/o".
The combining form for "flesh" is "sarc/o" or "sarc-".
The combining form is that the prefix osteo- is added.
The combining form for cervix is cervic/o.
The combining form of the word "asymptomatic" is "asympto-."
The combining form for imperfect is dysto-.
Combining form for shape
Nitrogen- is the combining form for nitrogen. For instance, nitrogenous means containing or related to nitrogen.