Standard Lemma guide
Definitions and examples are grouped by meaning. Pronunciation, history, word forms, translations, descendants, synonyms, antonyms, derived terms, and related words appear whenever the source provides them.
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noun
Any of the subclass Heterostraci of extinct jawless vertebrates that lived primarily in marine and estuary environments.
Definition source: English Wiktionary via Wiktextract
No example sentence was provided for this meaning.
Synonyms: none provided
Antonyms: none provided
noun
extinct jawless fish with the anterior part of the body covered with bony plates; of the Silurian and Devonian
Definition source: Princeton WordNet 3.0
No example sentence was provided for this meaning.
Synonyms: none provided
Antonyms: none provided
Broader terms: jawless vertebrate, jawless fish, agnathan
History
Heterostraci + -an
