Lewis & Short

nīdāmentum, i, n. [nidus].

  1. * I. The materials for a nest: in nervum ille hodie nidamenta congeret, he will scrape together a nest to get himself a drubbing, Plaut. Rud. 3, 6, 51.
  2. * II. Transf., a nest. blattas nidamenta ponere, Arn. 6, 202.