drip tip

Short definition from Wiktionary

Noun

1. 1
   An elongated leaf tip from which excess water can drip harmlessly, as found in plants of the rainforest.
2. 2
   An elongated extension to the wall of a structure, such that unwanted water drips off, as found in the nests of some species of rainforest paper wasps.
3. 3
   An attachment for an e-cigarette that drips e-liquid directly onto the atomizer.