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the above transcription of thermos is a detailed (narrow) transcription according to the rules of the International Phonetic Association; you can find a description of each symbol by clicking the phoneme buttons in the secction below.
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An example use of thermos in a speech by a native speaker of american english:
“… and serving as a thermos in your life to …”
A thermos is a vacuum flask that keeps hot things hot and cold things cold.
the word thermos occurs in english on average 0.8 times per one million words; this frequency warrants it to be in the study list for C2+ level of language mastery according to CEFR, the Common European Framework of Reference.