Definition: (noun) A usually dense, cylindrical, often drooping cluster of unisexual apetalous flowers found in willows, birches, and oaks.
Synonyms: ament.
Usage: Walking some forty paces away, Sergey Ivanovitch, knowing he was out of sight, stood still behind a bushy spindle-tree in full flower with its rosy red catkins.
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Source: The Free Dictionary