Orthodontics 

BDSM for the teeth. You know you're into kinky shit when you get braces.

Friend 1: "Yo I just got braces. Man, they suck."
Friend 2: "Oh... I see you're into orthodontics."
Friend 1: "No! It's just that my teeth need to be straightened."
Friend 2: "Sure, man. It's 2019. We don't kink shame. And your teeth can be as gay as they want."

Orthodontics by aglorifiedpotatowithlegs October 30, 2019

orthogender 

Not transgender. That is, having the socially expected gender identity for the sex one was assigned at birth. Used in preference to the word cisgender which many orthogender people reject as being applied to them by other groups.

Sarah always asked people to respect her self identity and use the term orthogender.

orthogender by Orthiopterix November 6, 2013

orthopod 

n. specialist physician; an orthopedist or orthopedic surgeon

1. Karen Allen was laughing so hard that she fell down and broke her wrist. She kept up the witty repartee even when seeing the orthopod at the ER.

2. It's ironic that Dr. Rosenberg broke his arm in an ice-hockey game, because he's the orthopod who treated Bobby Hull.

orthopod by hmakav December 14, 2010

Ortholysis 

(noun): the wrapping around of a mathematical function under transformation into a higher nth-dimensional space where n > 2 and n ∈ ℤ+. This twisting occurs typically when a 2D function is integrated by rotating about the x-axis in order to find the volume of the 3rd-dimensional shape.

Ortholysis is used to describe this behaviour in various different sub-branches of integral calculus. The origin of this word is still unknown. However, this neologism was rumoured to have been coined by a Romanian scientist and mathematician. i

Student: "Would the integral of y=−ze^x about the x-axis give you some sort of pulsar-like ortholysis spirally thing?"
Teacher: "Sort of. It depends on your limits and of course the fact that your equation doesn't consider that a pulsar visualisation with that equation would be rotating about the y-axis!"
Teacher: "And also the fact that the center of mass is not represented accurately in any way and you'd need to make it asymptotic."

Ortholysis by globaldefinitions March 4, 2017

orthopterophobia 

Fear of crickets, locusts, grasshoppers, etc.

I have orthopterophobia. I really hate crickets. They scare me

orthopterophobia by ImAwesomeAndPretty101 June 14, 2018

Orthodox Celts 

An awesome band from Serbia which plays Irish music. Their frontman is called Aca Celtic (Aca is pronounced "Azza", like "pizza" with an A instead of PI) and he rocks. Most of their songs are in English, and they make their own songs (like "Far Away") as well as playing old Irish ones (like "Rocky Road to Dublin").

Aca Celtic was once bullied by one of his teachers in high school and then came back with his crew and dumped the bastard in a garbage container.
Orthodox Celts usually make a New Year concert every year in Serbia.

Orthodox Celts by Baklava42 January 21, 2007

orthogonal 

Used to describe two things that are independent of each other. One does not imply the other.

Common sense and intelligence are orthogonal. I've seen plenty of smart people with no common sense.

orthogonal by WJ Callahan January 14, 2009