TOEFL IELTS surface Definition The outer or top layer of an object or material. Example "Algae began to grow on the surface of the pond." Sign in to save TOEFL PDF — $25 IELTS PDF — $25 ← surcharge surfeit → Study tips featuring "surface" 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