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nounthe top layer of a soil profile; usually contains humus
Similar:
Definition that contains a horizon
- bar a horizontal rod that serves as a support for gymnasts as they perform exercises
- tie a horizontal beam used to prevent two other structural members from spreading apart or separating
- heading a horizontal (or nearly horizontal) passageway in a mine
- gallery a horizontal (or nearly horizontal) passageway in a mine
- runner a horizontal branch from the base of plant that produces new plants from buds at its tips
- drift a horizontal (or nearly horizontal) passageway in a mine
- rail a horizontal bar (usually of wood or metal)
- offset a horizontal branch from the base of plant that produces new plants from buds at its tips
- traverse a horizontal crosspiece across a window or separating a door from a window over it
- traverse a horizontal beam that extends across something