From em- + pierce.
empierce (third-person singular simple present empierces, present participle empiercing, simple past and past participle empierced)
- (now rare) To pierce through.
- 1590, Edmund Spenser, The Faerie Queene, I.xi:
- The weapon bright / Taking aduantage of his open iaw, / Ran through his mouth with so importune might, / That deepe emperst his darksome hollow maw [...].