Webster's Revised Unabridged Dictionary · 1913

ammonoid

ammonoid , noun

1.

one of the coiled chambered fossil shells of extinct mollusks; same as ammonite.

Text from the public-domain GNU Collaborative International Dictionary of English, derived from Webster's Revised Unabridged Dictionary (1913). Definitions marked with were added by later GCIDE contributors and are not in the original 1913 edition.

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