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A rendition of the widely known sexual act known as "scissoring", which typically consists of two participants. However, when a third person daringly decides to join in, it is referred to as the "Tri-Sci", due to the positioning/layout of the three participants and their genitalia. This act can be performed by three females, two males and one female, or three males. Although many have attempted the Tri-Sci with two females and one male, it has proved to be an impossible task.
-Are you two scissoring?!?
-Yeah! wanna join in?
-I don't know if I'm flexible enough to pull off the Tri-Sci, but let's go for it!
Tri-Sci by RICHvcl May 6, 2011
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Taking all three major branches of science (Biology, Chemistry, and Physics) at the same time in high school.
"I don't know which science I'll study in college, so I'll take tri sci to expand my options."
Tri Sci by ninjaraccoon19 December 8, 2013

Terra Sci-Fi 

A storyline/Genre with magical/mystical/abnormal elements, but that COULD be happening in our normal world
A race of Mutants living in the sewers fits well into the Terra Sci-Fi genre.
Terra Sci-Fi by MicaMay October 9, 2008

Ender / Sci 

Simp!!!
Is that ender / sci

Yes
He is looking very gay today
Ender / Sci by Banana yogurt October 10, 2020

poly sci 

Political Science - as used to describe a group of classes
my poly sci prof is so fucking boring, I want to pull my hair out.
poly sci by theshadowmonkey July 16, 2008

health sci 

People who get upset when they cannot obtain a 12 in non-health sci courses, so much so that they cry to the professors. Synonym to penis-head.
I once overheard a health sci while speaking to a professor about a 9 on a test, "Are you serious that you won't change my grade to a 12? *begins crying* But I ALWAYS get 12's!"
health sci by non-health sci April 1, 2009
Hi-Sci is the high frequency and low noise style attributed to very sleek and high media science fiction visualizations. Focusing primarily on the overall surface materials involved, Hi-Sci describes the overall feel one gets if they were to look directly into the future and visualize what it potentially may look like.

Hi-Sci also describes the level of use of already existing Sci-Fi ideologies, events, characters or places within another work of science fiction.
The look of that user interface is very rounded and sleek and has a very Hi-Sci feel to it.

I read that manuscript and found it to be very Hi-Sci with many of the elements being the same as other available well known materials.
Hi-Sci by Matthew Randall February 16, 2009