The meaning of rivulet is a small stream. how to use rivulet in a sentence. Rivulet meaning: 1. a very small stream or flow of liquid: 2. a very small stream or flow of liquid: . learn more. Rivulet definition, a small stream; streamlet; brook. see more. Synonyms for rivulet: beck, bourn, brook, brooklet, burn, creek, gill, rill. Define rivulets. rivulets synonyms, rivulets pronunciation, rivulets translation, english dictionary definition of rivulets. n. a small brook or stream; a streamlet.