
The pseudobulb is a storage organ derived from the part of a stem between two leaf nodes. It applies to the orchid family (Orchidaceae), specifically certain groups of epiphytic orchids, and may be single or composed of several internodes with evergreen or deciduous leaves along its length. In some species, it is hardly swollen at all and looks li...
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http://en.wikipedia.org/wiki/Pseudobulb

This is the storage reservoir on sympodial orchids such as Oncidiums, Cattleyas, Zygopetalums, and many, many other orchid genera. A pseudobulb is a part of the plant that can appear as a normal stem or a large, swollen growth. Leaves and ultimately spikes grow off of pseudobulbs. The pseudobulb stores water and nutrients that the plant needs to ...
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http://larrysorchids.com/pages/orchid-glossary-of-terms

a swollen bulb like part of most orchids that holds the leaves and is attached to the rhizome
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http://orchidfetish.com/glossary.html

Thickened bulb-like stems of sympodial orchids bearing nodes.
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http://www.anbg.gov.au/cpbr/cd-keys/orchidkey/html/glossary.html

A thickened portion of the stem, resembling a bulb, of many orchids, and some bromeliads. The pseudobulb functions as a water and food storage device.
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http://www.clanorchids.com/clanglos.htm

The thickened or bulb-form stems of certain orchids, the part being solid and borne above ground.
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http://www.gardenology.org/wiki/Glossary_of_Gardening_Terms

A thickened portion of the stem of many orchids functioning as a water and food storage device.
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http://www.orchidplantcare.info/orchid-glossary/

a swollen bulb like part of most orchids that holds the leaves and is attached to the rhizome
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http://www.orchidspecies.com/glossary.htm
noun a solid bulblike enlargement of the stem of some orchids
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https://www.encyclo.co.uk/local/20974

The swollen storage organ at the base of the stem of many Orchids.
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https://www.encyclo.co.uk/local/22488

a thickened and bulb-like internode or group of internodes in the stem of an orchid
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https://www.encyclo.co.uk/local/22591

an enlarged, aboveground portion of stem, present in many tropical orchids, in which moisture is stored.
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https://www.infoplease.com/dictionary/pseudobulb
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