From Middle French perçant, from percer (“to pierce”).
perceant (comparative more perceant, superlative most perceant)
- (now rare, archaic) Piercing, sharp. [from 14th c.]
- 1590, Edmund Spendser, The Faerie Queene, I.10:
- wondrous quick and persant was his spright, / As Eagles eye, that can behold the Sunne [...].