Most Americans say, He will live! After all, the thumbs-up sign is a positive thing. It's how we encourage our friends and silently show approval. But to the ancient Romans, a thumbs up mimicked the upward thrust of a sword through the heart. It meant, kill. A thumbs-down meant put your sword down. So where did this confusion about thumbs come from?
Freebase(0.00 / 0 votes)Rate this definition: Transfection. Transfection is the process of deliberately introducing nucleic acids into cells. The term is used notably for non-viral methods in eukaryotic cells.
A chronic skin disease having various causes, marked by the eruption of pale, dome-shaped papules that itch severely. [Latin prÅ«rÄ«gÅ, an itching, from prÅ«rÄ«re, to itch; see preus- in Indo-European roots.] pruÂ·rigâ²iÂ·nous (-rÄ­jâ²É-nÉs) adj.