Definition of treecreeper
- a small songbird with drab plumage and a down-curved bill that creeps around on the trunks of trees to search for insects. Compare with creeper (sense 2).
- a Eurasian and North American bird (Certhia, family Certhiidae, in particular the common C. familiaris). an Australasian bird (family Climacteridae and genus Climacteris).