Entry 1 sense Webster, 1913 Corroborant /(k?r-r?b"?-rant)/ · Cor·rob·o·rant · IPA 01 a. Strengthening; supporting; corroborating. 1. Strengthening; supporting; corroborating. “The brain, with its proper corroborants, especially with sweet odors and with music.” — Southey.