retrophoria 

a feeling of intense happiness or well-being while surrounding oneself with items of the past.

Verb
retrophoric

A feeling of retrophoria came over Mary when she entered the museum.

retrophoria by The Shopping Guru September 27, 2011

retrophobia

fear of past things or events.

Her past is scary. Remembering it is painful for her. She has retrophobia.

retrophobia by Uttam Maharjan 2 April 11, 2015

RETROPHOBIC 

Someone who is against change, who resists the fact that nothing in life remains the same and always wants to go back to the way things or events were.

John is so retrophobic, he cannot embrace the fact that life is forever evolving and changing. He resists the changes in his life.

RETROPHOBIC by DENAZI - DEE November 6, 2009

Retrophysics

The umbrella term for any branch of physics that describes phenomena as they would appear if time ran backward. It encompasses retrothermodynamics, retromechanics, retroentropy—the whole suite of physical laws operating in reverse chronological order. Retrophysics is a powerful tool for thought experiments, helping physicists understand why certain processes are irreversible even when the underlying equations are time-symmetric. It's the physics of the rewound tape, the universe played backward, the cosmic movie running from credits to opening scene.

Example: "The professor assigned a retrophysics problem: calculate what the solar system would look like if we ran the equations backward for a billion years."

Retrophysics by Dumu The Void March 11, 2026