Usually means: Ancient extinct group of echinoderms.
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We found 11 dictionaries that define the word sigillarid:

General (10 matching dictionaries)
  1. sigillarid: Merriam-Webster
  2. sigillarid: Collins English Dictionary
  3. sigillarid: Wordnik
  4. sigillarid: Wiktionary
  5. Sigillarid, sigillarid: Dictionary.com
  6. Sigillarid: Online Plain Text English Dictionary
  7. sigillarid: Webster's Revised Unabridged, 1913 Edition
  8. Sigillarid: AllWords.com Multi-Lingual Dictionary
  9. sigillarid: FreeDictionary.org
  10. Sigillarid: TheFreeDictionary.com

Medicine (1 matching dictionary)
  1. online medical dictionary (No longer online)

Definitions from Wiktionary (sigillarid)

noun:  (archaic, paleontology) Any of an extinct family of cryptogamous trees, especially of the genus Sigillaria, and similar species.

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