"Dorsi-" means back.
dorsi, dorso, postero
The medical terminology combining form meaning lower back is "lumb/o" or "lumb".
The medical terminology combining form meaning hands is mano-
Oligo- is the medical terminology combining form meaning scanty.
Pancreo- is the medical terminology combining form meaning pancreas.
Cerebro- is the medical terminology combining form meaning cerebral.
Ferr- is the medical terminology combining form meaning iron.
Metatars- is the medical terminology combining form meaning metatarsal.
Hypno- or somno- is the medical terminology combining form meaning sleep
Hepat/o is the medical terminology combining form meaning liver.
Uretero- is the medical terminology combining form meaning Ureters or urinary ducts
Hypo- is the medical terminology combining form meaning decreased.