Medical Dictionary
vertical
adj ver·ti·cal \ˈvərt-i-kəl\
Medical Definition of VERTICAL
: relating to or being transmission (as of a disease) by genetic inheritance or by a congenital or perinatal route <vertical transmission of the hepatitis B virus from mother to infant>—compare horizontal 2
—ver·ti·cal·ly \ˈvərt-i-k(ə-)lē\ adverb
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