World English Dictionary
odour or odor (ˈəʊdə)
1.  the property of a substance that gives it a characteristic scent or smell
2.  a pervasive quality about something: an odour of dishonesty
3.  repute or regard (in the phrases in good odour, in bad odour)
[C13: from Old French odur, from Latin odor; related to Latin olēre to smell, Greek ōzein]
odor or odor
[C13: from Old French odur, from Latin odor; related to Latin olēre to smell, Greek ōzein]
'odourless or odor
'odorless or odor

Collins English Dictionary - Complete & Unabridged 10th Edition
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Encyclopedia Britannica


the property of certain substances, in very small concentrations, to stimulate chemical sense receptors that sample the air or water surrounding an animal. In insects and other invertebrates and in aquatic animals, the perception of small chemical concentrations often merges with perception via contact of heavy concentrations (taste), and with other chemoreceptive specializations. See also smell.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
Your socks will hold shape but not odour for the long haul.
The meteorite has always been known for its strong odour, presumably caused by
  the organic chemicals it contains.
On wet days there would be an unpleasant odour of dampness, an aroma of
  overcoats dried by body-heat.
Or rather, neither its odour nor its substance is likely to rise up in the
  faces of those poor overworked nurses.
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