acescent /əˈsiːsənt/adjective 1noun 1forms 3 adjective1 •Turning sour; readily becoming tart or acid; slightly sour.The fluid was a pale yellow , thick , creamy - looking substance , of uniform consistency . It had a disagreeable acescent odour, something resembling that of putrecsent milk. — 1826 noun1 •A substance liable to become sour. formsacescents · more acescent · most acescent