The medical terminology combining form meaning "thirst" is "dips/o" or "dipsia".
Thirst
Dips/o
Dips/o
dips/o is the combining form -dipsia is the suffix
The combining form for dermatologist is dermat/o.
The combining form for "gingivo-" is "gingiv/o-".
The combining form meaning "one who specializes in" is "-ologist".
Combining form for shape
The combining form is that the prefix osteo- is added.
The combining form for imperfect is dysto-.
The combining form of the word "asymptomatic" is "asympto-."