pseudobulb
Noun
Meaning
a solid bulblike enlargement of the stem of some orchids
Source: WordNetHypernyms
Examples
The pseudobulb has a smooth surface with lengthwise grooves, and can have different shapes, often conical or oblong.
The pseudobulb of Prosthechea fragrans The base of the stem of sympodial epiphytes, or in some species essentially the entire stem, may be thickened to form a pseudobulb that contains nutrients and water for drier periods.