| adjuvant | (adjective) enhancing the action of a medical treatment | - |
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| (adjective) furnishing added support | Synonyms: accessory, adjunct, ancillary, appurtenant, auxiliary |
| (noun) an additive that enhances the effectiveness of medical treatment | - |
| juvenescence | (noun) the process of growing into a youth | - |
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| juvenile | (adjective) of or relating to or characteristic of or appropriate for children or young people | - |
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| (adjective) displaying or suggesting a lack of maturity | Synonyms: adolescent, jejune, puerile |
| (noun) a young person, not fully developed | Synonyms: juvenile person |
| juvenility | (noun) the freshness and vitality characteristic of a young person | Synonyms: youth, youthfulness |
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| (noun) lacking and evidencing lack of experience of life | Synonyms: callowness, jejuneness |
| rejuvenate | (verb) become young again | - |
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| (verb) make younger or more youthful | - |
| (verb) develop youthful topographical features | - |
| (verb) get or give new life or energy; return to life, regain energy, recuperate | Synonyms: regenerate, restore |
| (verb) cause (a stream or river) to erode, as by an uplift of the land | - |
| rejuvenation | (noun) the act of restoring to a more youthful condition | - |
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| (noun) the phenomenon of vitality and freshness being restored | Synonyms: greening |
| rejuvenescence | (noun) A renewal of youthful characteristics or vitality. | - |
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