concentric 

You will learn this in geometry.

Concentric means "sharing the same center". Con- = used multiple times, -Centric = center-related. (like cooperate: multiple people doing the same task)

So, it's like a dartboard or bullseye: the circles are all around the same point.

Something three-dimensional, like cylinders (water bottles, spray cans), may be coaxial.

The solar system is concentric. All the planets orbit the sun.

A properly set table has the bowls and plates concentric.

concentric by Solomon H July 16, 2008

molar concentration 

Something you learn in chemistry which my cousin calls hell

I would rather eat Popeyes biscuit than learn molar concentration

molar concentration by Aughbygarrison May 16, 2022

Concentration douche face

The equivalence to resting bitch face, only this is the face made whenever someone is reading or working.

"Yo man you look really pissed. Is everything okay?"
"Oh yeah. I just have concentration douche face."

Concentration douche face by Jumbawumba April 2, 2015

cockcentric 

Centered or focused around male genitalia.

The porno had two girls and one guy, but it was still very cockcentric.

cockcentric by Joe Camp January 10, 2006

concentration tongue 

Much like drummer tongue, the act of unconsciously sticking the tongue part way out of the mouth while performing any task requiring concentration.

Billy must find colouring difficult: his concentration tongue is sticking out.

concentration tongue by Chibi Jeeb December 27, 2010

puerto rican concentration camp

When a Puerto Rican man ejaculates such an exorbitant amount of semen into an object, leading to the murder of millions of would-be Puerto Rican children in one place.

This dude Hernan has dumped so many loads in his mattress it's like a Puerto Rican concentration camp.

puerto rican concentration camp by pp9k December 17, 2017

Concentration Cramp 

An alternative name for a headache.

Discomfort experienced when an individual has been focusing on a task for too long and needs a break.

"All this cramming for our European history class will be worth it when we get an A"

"I sure hope so, memorizing all the dates is giving me a serious concentration cramp"

Concentration Cramp by ratherdashing April 1, 2017