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Antonyms for Protuberan. (2016). Retrieved 2026, August 14, from https://thesaurus.plus/antonyms/protuberan
Antonyms for Protuberan. N.p., 2016. Web. 14 Aug. 2026. <https://thesaurus.plus/antonyms/protuberan>.
Antonyms for Protuberan. 2016. Accessed August 14, 2026. https://thesaurus.plus/antonyms/protuberan.