downwell

Short definition from Wiktionary

Verb

1. 1
   To sink below material of lower density.
2. 2
   To penetrate water downward.

Noun

1. 1
   A vertical shaft or well in which water flows downward.
2. 2
   Synonym of downwelling.

Adjective

1. 1
   In the lower part of a well.
2. 2
   towards the nearest planet or other gravity well.

Adverb

1. 1
   In the lower part of a well.
2. 2
   toward the nearest planet or other gravity well.