Dorsal is the back , along the spine, i.e., a dorsal fin on a fish, a person laying on their back is said to be in a dorsal recumbant position.
Posterior?
luminosity is synonymous to brightness
Dorsal comes from the Latin word dorsum, meaning the back.
The dolphin has a dorsal fin.
Decrease
Syonymous is the adjectival form of synonym.
You've spelled the word "synonymous" correctly :)
extend
Synonymous means having the same meaning as another word or phrase. Aggression is often believed to be synonymous with violence.
synonymous.
avarice
Necessary, important