Word.ws English Dictionary

ammonoid

ammonoid noun: an extinct cephalopod of the subclass †Ammonoidea (including ammonites).

Noun

ammonoid (plural ammonoids)

  1. An extinct cephalopod of the subclass †Ammonoidea (including ammonites).
    • Although the extinct externally shelled cephalopods ammonoids have an extensive fossil record, their soft tissues are very poorly known and, like extinct and living nautiloids, they are largely presumed to not have possessed an ink sac.2017 August 9, Mark Carnall, “Why do cephalopods produce ink? And what's ink made of, anyway?”, in The Guardian

Adjective

ammonoid (comparative more ammonoid, superlative most ammonoid)

  1. Characteristic of an ammonite.
    • Literally tens of pence with an ammonoid fossil to highlight how bling bling the world of palaeontology has become2016 November 9, Mark Carnall, “Is palaeontology a waste of public money?”, in The Guardian

Forms of ammonoid

Noun
pluralammonoids
Adjective
comparativemore ammonoid
superlativemost ammonoid

Origin of ammonoid

From the scientific name Ammonoidea, equivalent to Ammon + -oid.

Questions about ammonoid

What does ammonoid mean?
Ammonoid means an extinct cephalopod of the subclass †Ammonoidea (including ammonites).
What part of speech is ammonoid?
Ammonoid can be a noun or an adjective.
What is the plural of ammonoid?
The plural of ammonoid is ammonoids.

Words near ammonoid in the dictionary

  1. ammoniuria
  2. ammonization
  3. ammonize
  4. ammonized
  5. ammono
  6. ammonoid
  7. ammonoidean
  8. ammonoids
  9. ammonolyses
  10. ammonolysis
  11. ammonolyze

Source and license

Adapted from Wiktionary: ammonoid (page history and authors). Text available under the Creative Commons Attribution-ShareAlike 4.0 license. Word.ws reformatted the entry and added links. Wiktionary data of 2026-09-02.

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