noun🔗ShareFormalineA solution of formaldehyde in water; used as a disinfectant and to preserve biological specimens."The science teacher carefully placed the frog into a jar of formalin to preserve it for future study. "Le professeur de sciences a soigneusement placé la grenouille dans un bocal de formaline pour la conserver en vue d'études futures.medicinesubstancechemistrybiologyChat with AIVocabulary GamePractice Reading