Walls

Walls are an important and perhaps undervalued habitat for native plants. The most important walls are dry stone walls or old walls with lime mortar rather than cement. Several of our native ferns are more commonly found on walls than in their natural habitat, on limestone cliffs. For example Asplenium ruta-muraria, A. trichomanes, A. adiantum-nigr...
Found on http://www.botanicalkeys.co.uk/flora/content/glossary.html

walls

the vertical sides to a pipe. These comprise two elements- the 'transition' and the 'vert'
Found on http://www.goodskiing.co.uk/essentials/skiglossary.htm

Walls

The sides next to the lode.
Found on http://www.legendsofamerica.com/

Walls

One of the sides of a room or building connection floor and ceiling or foundation and roof:
Found on http://www.contractorschoolonline.com/Masonry-Glossary.aspx

Walls

A painting made directly on a wall or a ceiling is termed a mural. The surface of the wall has to be
Found on http://www.encyclo.co.uk/local/22428

Walls

[Tom Petty and the Heartbreakers song] ...
Found on http://en.wikipedia.org/wiki/Walls_(Tom_Petty_and_the_Heartbreakers_song)
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