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thallo-

  1. a combining form meaning “young, green shoot”, used in the formation of compound words: thallium.
  2. a combining form representing thallus in compound words: thallophyte.
  3. a combining form representing thallium in compound words: thallic.
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Also especially before a vowel, thall-.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018