pseudobulb

[soo-duh-buhlb]
noun Botany.
an enlarged, aboveground portion of stem, present in many tropical orchids, in which moisture is stored.

Origin:
1825–35; pseudo- + bulb

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American Heritage
Science Dictionary
pseudobulb  [%PREMIUM_LINK%]     (s'dō-bŭlb')  Pronunciation Key 
A thickened, bulblike, fleshy stem located above the ground, as in many orchids. See also bulb, corm.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences for pseudobulb
The erect to pendent inflorescence arises laterally from the base of the pseudobulb.
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