halcyonic

totally calm and especially chill; not causing harm to anyone; very peaceful

I don't believe he started the fight, that dude is so halcyonic.

by Hal Cyonic March 15, 2015

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Halcyonic System

Any solar system orbiting an object that was once a main sequence star, but isn't anymore (i.e. black holes, white dwarves, red giants, magnetars, pulsars, etc.).

The solar system will become a halcyonic system as the Sun dies.

by An_Idot September 21, 2024

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Halcyonic Planet

Any planet in a halcyonic system (i.e. KMT-2020-BLG-0414L b, WD1054–226 b, WD 1856 b, etc.)

There are also halcyonic dwarf planets, the only example of which is WD 1145+017 b.

In 2020, we discovered the first halcyonic planet around a white dwarf.

by An_Idot September 21, 2024

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Halcyon

Meaning a period of time in the past thought to be peaceful and pleasant

the halcyon days of Freshman high... (said no one ever)

by Girei August 10, 2018

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Halcyon Days

Almost literally means the "calm before the storm", but can also be used to signify joy, tranquility, etc.

Goodbye Halcyon Days.

by Kaba April 17, 2008

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An all around great person who is always willing to listen and checks in on you. They're an amazing person and be happy if you have them as a friend. Their name shows their uniqueness and individuality. As well as their peacefulness that they hold.

Damn hanging out with Halcyon was so nice. I gotta hangout with them more.

by hollow_gravity♡ June 29, 2021

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