Synonym: ageing, aging. Similar words: adolescent, descend, scene, scenery, acquiescence, obsolescence, scent, nascent. Meaning: [sɪ'nesnt] 
adj. growing old.
adj. growing old. 31. Mice fed a restricted diet had a reduced accumulation of senescent cells in their livers and intestines.
More similar words: adolescent, descend, scene, scenery, acquiescence, obsolescence, scent, nascent, gentleness, scenario, awareness, sentiment, effectiveness, Cent., center, recent, per cent, decent, accent, century, central, absent, incentive, recently, consent, present, benevolent, centurion, percentage, sentence.