The term 'penetrable' can be defined as having the ability to be penetrated or passed through. This term can be broken down into three crossword solutions: 'LIABLE' (6 letters), 'POROUS' (6 letters), and 'PERVIOUS' (8 letters). 'LIABLE' means legally responsible or answerable, while 'POROUS' refers to something that is full of tiny holes, allowing liquids or gases to pass through. Lastly, 'PERVIOUS' means capable of being penetrated or permeated. All three words describe the term 'penetrable' in different ways, emphasizing its ability to be penetrated.