
Mason bee is a common name for species of bees in the genus Osmia, of the family Megachilidae. They are named from their habit of making compartments of mud in their nests, which are made in hollow reeds or holes in wood made by wood-boring insects. Species of the genus include the orchard mason bee, Osmia lignaria, the blueberry bee, O. ribiflori...
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http://en.wikipedia.org/wiki/Mason_bee

[
n] - any of numerous solitary bees that build nests of hardened mud and sand
Found on
http://www.webdictionary.co.uk/definition.php?query=mason%20bee
noun any of numerous solitary bees that build nests of hardened mud and sand
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https://www.encyclo.co.uk/local/20974
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