Lewis & Short

praepĭlo, no

  1. I. perf., ātum, 1, v. a. [praepilum], to point in front or at the end like a pilum (post-class.): praepilatis missilibus principiis pugnae tentatis, Amm. 24, 6, 10
  2. II. To throw forwards, hurl before (postclass.): praepilabantur missilia, Amm. 16, 12, 36.