Time Lords appear human, but are different. Time Lords can live for an extremely long time thanks to their ability to regenerate.

Time Lords regenerate after suffering from mortal injury, illness, or old age.

Regeneration repairs and rejuvenates all damage. But a side effect is that it changes the Time Lords physical appearance, and they gain a some what different personality.

Regeneration can be traumatic, and can leave the Time Lord disoriented, and weakened.
"Whats happening?"

"He's regenerating, he's changing"
by Stefani Bigaran August 23, 2005
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From doctor who:

Time lords can regenerate and have a new face and slightly different personality.

They regenerate when they are about to die, are severely ill or old age.

However a Timelord only has the ability to do this 12 times. (Doesnt matter much to them, in one life they Usually live to about a thousand anyway. Notice I said usually.) This means that they have 13 faces
''Kidneys, ive got new kidneys... dont like the colour.''
''Of your kidneys?''

"Whats happening?"

"He's regenerating, he's changing"

''Regeneration is strange, why does he regenerate 12 times?'' A whovian
''Who cares about your stupid doctor who shit?'' Some random guy
by The Armored Player September 15, 2018
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when buu gets dealt a fatal blow and everyone rejoices. then he just regenerates and is back again. wasted 250 episodes doing this. the plot went no where
buu regenerated again. let's go get hammered
by Phil January 28, 2005
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Regeneration grief, also referred to as RG, is the process of grief that Whovians go through when the Doctor is regenerating. There are 5 stages of this process: 1) SADNESS when you find out that the Doctor is going to regenerate. 2) HATRED of the next Doctor when you find out who is replacing the old one. 3) DISGUST that they would ruin Doctor Who by casting this person to be the Doctor. 4) ADMITTING to yourself that this new actor isn't so bad... and, 5) ACCEPTING that you have become a total fangirl/fanboy, and never want this person to leave, ever.

Then the cycle repeats, over and over again, continuously breaking the hearts of every Whovian in the galaxy.
Person 1: "HELP I'M DYING, THE 11TH IS REGENERATING!!!!!"
Person 2: "Oh calm down, you're not dying."
Person 1: "THEN WHAT IS THIS STABBING PAIN I FEEL IN MY HEART?!"
Person 2: "That? Oh, don't worry. This is just the beginning of your RG {regeneration grief}, it'll be over soon."
by cohare2004 July 17, 2017
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An exclamation used to describe the action of regeneration of a players equipment.
GG l2 3 G 3 N 3 l2 4 7 1 0 n
by Anonymous July 17, 2003
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the act of sucking the life force out of incels.

Rayy_Chull's favorite passtime
my main super power is Hemato-incelic Regeneration, kinda like a vampire.
by CmndBean July 26, 2023
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