washbasin Get Printable Handwriting (wash-ba-sin) 3 syllables Rhymes Learn It! Spelling Test Definition noun. a bathroom sink that is permanently installed and connected to a water supply and drainpipe; where you can wash your hands and face Example Sentence She washed her hands in the washbasin. Spelled as one word. Synonyms basin; washbowl; washstand; lavatory Antonyms oven Rhymes Three Syllable Rhymes (1) washbasin Share with your friends: