Usually means: Having a soft, poorly formed mouth.
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We found 10 dictionaries that define the word malacostomous:

General (9 matching dictionaries)
  1. malacostomous: Wordnik
  2. malacostomous: Wiktionary
  3. Malacostomous, malacostomous: Dictionary.com
  4. Malacostomous: Online Plain Text English Dictionary
  5. malacostomous: Webster's Revised Unabridged, 1913 Edition
  6. Malacostomous: AllWords.com Multi-Lingual Dictionary
  7. malacostomous: Webster's 1828 Dictionary
  8. malacostomous: FreeDictionary.org
  9. Malacostomous: TheFreeDictionary.com

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

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Definitions from Wiktionary (malacostomous)

▸ adjective:  (zoology, archaic) Having soft jaws without teeth.

Similar:
round-mouthed, Malacozoic, opisthognathous, malacozoological, anisodont, malacofaunal, amblygnathous, agomphious, paucidentate, softshell, more...

Opposite:
stiff, rigid, inflexible, hard

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Similar:
round-mouthed, Malacozoic, opisthognathous, malacozoological, anisodont, malacofaunal, amblygnathous, agomphious, paucidentate, softshell, more...

Opposite:
stiff, rigid, inflexible, hard



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