a horizon

1. 1.

   the top layer of a soil profile; usually contains humus

   SynonymsA-horizon

   Broadersoil horizon

Questions about a horizon

What does a horizon mean?

a horizon means "the top layer of a soil profile; usually contains humus".

What is another word for a horizon?

Close synonyms include A-horizon. Each sense on this page lists its own synonyms, because a word with several meanings rarely has one substitute that works for all of them.

Is a horizon a common word?

a horizon is banded "Uncommon" — turns up in careful writing rather than conversation. The band comes from how often the word appears in a large corpus of everyday English, not from an editor's impression.