TOEFL IELTS thermometer Definition An instrument that measures temperature. Example "The doctor used a thermometer to check the patient's fever." Sign in to save TOEFL PDF — $25 IELTS PDF — $25 ← thermal thermostat → Study tips featuring "thermometer" TOEFL Academic Vocabulary: Study by Topic Boost Your IELTS Writing With Precise Vocabulary Related words TOEFL brighten GRE abash GRE abate GRE abbreviate GRE abbreviation SAT abdicate GRE abduct SAT abet GRE abhor GRE abide SAT abject TOEFL ablaze