Wikipedia logo The Simple English Wikipedia has an article on: Horizontal Pronunciation (UK) IPA (key): /ˌhɒrɪˈzɒntəl/, SAMPA: /%hQr@"zQnt@l/ (US) IPA (key): /ˌhɔːrəˈzɑːntəl/, SAMPA: /%hO:r@"zA:nt@l/ Audio (US)(file) Adjective Positive horizontal Comparative more horizontal Superlative most horizontal Something that is lying down or "straight across" is horizontal. In a horizontal direction means straight across. The road across the Nullabor plain is horizontal. Dad hung a swing from a horizontal branch. Horizontal stripes on a shirt make a person look wider. (old, no longer used) To be horizontal means to have something to do with the horizon. Synonyms prone Antonyms vertical upright Related words horizontallyWikiwand - on Seamless Wikipedia browsing. On steroids.