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Consult Chambers 21st Century Dictionary, The Chambers Thesaurus (1996) or Chambers Biographical Dictionary (1997 edition with amendments). Enter your search and choose your title from the drop-down menu.

Search results for 'rill':

rill noun1 a small stream or brook. 2 a small trench or furrow. 3 astron see rille. 4 phonetics a fricative produced by forcing air out of a small gap formed between the tongue and the roof of the mouth. rilled adj.
ETYMOLOGY: 16c.

rille or rill noun, astron a long narrow trench or valley on the moon, formed by volcanic activity.
ETYMOLOGY: 19c: German, meaning 'a groove'.