Bulb-fly

noun
a hoverfly the larvae of which live in bulbs and can become ser ious pests, esp the yellow and black narcissus bulb fly (Meridon equestris)

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Bulb-keel
a narrow keel having a swelling weight of lead or iron at the bottom.
Bulb-mite
noun a widespread mite, Rhizaglophus eclinops, that tunnels in the bulbs of lilies and other plants
Bulb-of-corpus-spongiosum
bulb of corpus spongiosum