BIRO Antonyms There are 2 antonyms of the word biro. (opposite meanings)Did you mean?Definition of BIROSynonyms of BIROBest Opposite Words For BIROTop 20Top 10 Top 20 (Default)Top 50 Top 100 All All (Default)WordsPhrases All All (Default)Verb Noun Adjective Adverb RankWordSave?Synonyms..UsageType1penverb, nounv, n2pencilnounn Alternatives for PEN Words (5)composeinditepenitentiaryplaypenwriteOpposite words for pen