hor·i·zon·tal adj \ˌhȯr-ə-ˈzänt-əl, ˌhär-\
: relating to or being a transverse plane or section of the body
: relating to or being transmission (as of a disease) by physical contact or proximity in contrast with inheritance—compare vertical
—hor·i·zon·tal·ly \-əl-ē\ adverb
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