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thallo-

a combining form meaning “young, green shoot”, used in the formation of compound words: thallium.
a combining form representing thallus in compound words: thallophyte.
a combining form representing thallium in compound words: thallic.

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Also especially before a vowel, thall-.

Words nearby thallo-

thalia, thalidomide, thallic, thallium, thallium sulfate, thallo-, thalloid, thallophyte, thallous, thallus, thalweg
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020