Lewis & Short

2. excrēmentum, i, n. [excresco],

  1. I. an elevation, prominence: humilior inter excrementa costarum spina, Sid. Ep. 1, 2.
  2. II. Transf., of numbers which increase regularly in series: sic decem milia ceteraque excrementa, Mart. Cap. 7, § 734.