Amputation
Amputation was a surgical procedure whereby a patient's appendages were removed. It could be performed due to medical necessity or as a punishment. A part of the body that had been traumatically amputated in an accident could be said to have been severed. (

In 2151,  noted that if one were to rest one's hands on the handrail of a lift in 's engineering section during the lift's operation, one's fingers might be amputated. () 

In 2152, following his impalement by a Romulan mine, Malcolm Reed joked that he might consider allowing his leg to be amputated, except he thought that if  got hold of the severed limb, he would serve "Roast Reed" next Sunday. ()

Later that year, when Tucker assured Kaitaama that he wouldn't attempt to woo her, she warned him that if he did, the Sovereign Guard would cut off his hand. Tucker then quipped, "You must be a fun date." ()

In 2369, William T. Riker's arm was amputated and then surgically re-attached by solanogen-based lifeforms that were experimenting on crew members of . ()

In 2375, a severe injury to Nog's left leg necessitated amputation after Nog was shot by Jem'Hadar on AR-558 (), requiring him to deal with some psychological issues relating to the pain he felt even after receiving a new synthetic limb in its place. Vic Fontaine was able to help him with this psychological pain. ()

Also that year, when Tomin touched Seven of Nine's arm when inviting her to return to his quarters, him having studied Human mating rituals, she told him to "Remove your hand or I will remove your arm." ()

In 2376, Lieutenant Maxwell Burke joked with Seven of Nine about needing amputation for her minor injuries (first degree phaser burns and minor lacerations), which Seven did not appreciate. ()

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Medical procedures
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Punishments