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Noun: A horizon
  1. The top layer of a soil profile; usually contains humus
    - A-horizon

Derived forms: A-horizons

Type of: soil horizon

Encyclopedia: A horizon

Nearest

a cappella
a cappella singing
a couple of
a dime a dozen
a few
a fortiori
a good deal
a great deal
a heck of a
a hell of a
A horizon
a hundred times
a Kempis
à la carte
a la mode
A level
a little
a lot
a million times
a month of Sundays
a posteriori