anti- + -niem: Created in 1870, to serve as opposite of synonym, from Ancient Greek anti- "equal to, instead of, opposite" + -onym from Ancient Greek ὄνομα (ónoma) (onoma) 'name, word'
- Rhymes: -im
- Hyphenation: an‧to‧niem
antoniem n (plural antoniemen, diminutive antoniempje n)
- antonym (word which has the opposite meaning)