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Definition of Llandovery
1. Adjective. (geology) Of a geologic epoch within the Silurian period from about 443 to 428 million years ago; marked by the appearance of the trilobites. ¹
2. Noun. (geology) The Llandovery epoch. ¹
3. Proper noun. A market town in Carmarthenshire, Wales. ¹
¹ Source: wiktionary.com