Is “Horizontal” a Scrabble word?
Yes
HORIZONTAL
Valid in at least one Scrabble dictionary
Valid in these dictionaries
SOWPODS / CSW
Scrabble UK & International
TWL / NWL
Scrabble North America
Large English Dictionary
General English word list
Meaning of Horizontal
/ˌhɒɹɪˈzɒntəl/
noun
1.A horizontal component of a structure
2.Horizon
3.A Tasmanian shrub or small tree whose main trunk tends to lean over and grow horizontally, Anodopetalum biglandulosum
adjective
1.Perpendicular to the vertical; parallel to the plane of the horizon; level, flat
2.Relating to horizontal markets
3.Pertaining to the horizon
“1667: As when the Sun new ris'n / Looks through the Horizontal misty Air — John Milton, Paradise Lost, Book 1, ll. 594-5”
Synonyms: linear, melodic