posterior

Use the adjective posterior to describe something that's in the back. It’s often used in anatomy — a posterior cerebral artery supplies blood to the back of the brain, and the tail is on the posterior of a fish.

The prefix post means “after,” and things that are posterior come after the things in the front. The opposite of posterior is anterior, which refers to the front, usually of body parts. You can also use the word posterior to jokingly refer to the part of your body that you sit on — your backside. Posterior is also a formal way to say later in time.

Primary Meanings of posterior

1.
adjn
located at or near or behind a part or near the end of a structure
the fleshy part of the human body that you sit on
2.
adj
coming at a subsequent time or stage
Full Definitions of posterior
1

adj located at or near or behind a part or near the end of a structure

Synonyms:
back, hind, hinder
located at or near the back of an animal
caudal
situated in or directed toward the part of the body from which the tail arises
retral
at or near or toward the posterior
back
related to or located at the back
Antonyms:
anterior
of or near the head end or toward the front plane of a body
frontal
belonging to the front part
frontal
of or adjacent to the forehead or frontal bone
prefrontal
anterior to a frontal structure
front
relating to or located in the front
show more antonyms...

n the fleshy part of the human body that you sit on

Synonyms:
ass, backside, behind, bottom, bum, buns, butt, buttocks, can, derriere, fanny, fundament, hind end, hindquarters, keister, nates, prat, rear, rear end, rump, seat, stern, tail, tail end, tooshie, tush
Type of:
body part
any part of an organism such as an organ or extremity

n a tooth situated at the back of the mouth

Synonyms:
back tooth
Type of:
tooth
hard bonelike structures in the jaws of vertebrates; used for biting and chewing or for attack and defense
2

adj coming at a subsequent time or stage

“the mood posterior to”
Synonyms:
later, ulterior
subsequent
following in time or order

Sign up, it's free!

Whether you're a student, an educator, or a lifelong learner, Vocabulary.com can put you on the path to systematic vocabulary improvement.