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| pertaining to creatures without a backbone |
| phylum comprised of mollusks |
| Main Entry: | crepuscular1 |
| Part of Speech: | adj |
| Definition: | pertaining to twilight, esp. in dimness |
| Etymology: | Latin crepusculum |
| Main Entry: | crepuscular2 |
| Part of Speech: | adj |
| Definition: | appearing or active at twilight |
| Etymology: | Latin crepusculum |
| Usage: | zoology |