Superlative form of bulbous; most bulbous, or having the most pronounced bulb-like shape.
From 'bulby' or 'bulbous' (from Latin 'bulba') plus superlative suffix '-est' for the highest degree.
The 'bulbiest' tulip bulb in the bag is the roundest and most swollen one—it usually produces the healthiest, most vigorous plant.
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