Having a crenate edge; possessing a scalloped or notched margin with small projections.
From crenate plus the past participle suffix -ed, emphasizing the state or condition of being crenate. Sometimes used interchangeably with crenate, though -ed form more explicitly emphasizes the completed or permanent state.
The double form 'crenated' shows how English likes to reinforce adjectives, though scientists usually stick with just 'crenate'—the -ed adds emphasis but feels redundant to those trained in Latin-based terminology.
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