American Heritage Dictionary
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Century Dictionary
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GNU Webster's 1913
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WordNet
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Elsewhere on the web
Subtlest of all, perhaps, is the habit some hermit-crabs have of entering into mutually beneficial partnership (commensalism) with sea-anemones, which mask their bearers and also serve as mounted batteries, getting transport as their reward and likewise crumbs from the frequently spread table.— The Outline of Science, Vol. 1 (of 4) A Plain Story Simply Told
This kind of mutually beneficial external partnership is called commensalism, i.e. eating at the same table.— The Outline of Science, Vol. 1 (of 4) A Plain Story Simply Told
Moreover, as the term commensalism (eating at the same table) suggests, the partnership is mutually beneficial.— The Outline of Science, Vol. 1 (of 4) A Plain Story Simply Told
In commensalism, the commensal gains but the host neither gains nor loses.— PLoS ONE Alerts: New Articles
Moreover, as the term commensalism— The Outline of Science, Vol. 1 (of 4) A Plain Story Simply Told

Century Dictionary (1)
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