An archaic or dialectal term for a flowering of a plant, or possibly a regional variant of bloom or blossom.
Possibly from Old English or a regional dialect variant. The exact etymology is uncertain, but it may relate to Old Norse or Scandinavian roots similar to 'bloom' and Old English 'blóstm' (blossom).
Words like 'blooth' are linguistic fossils—they hint at lost regional dialects and show how flower-related vocabulary was so important that every region had multiple terms for blooming and flowering.
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