acrania

noun
acra·​nia | \ (ˈ)ā-ˈkrā-nē-ə How to pronounce acrania (audio) \

Medical Definition of acrania

 (Entry 1 of 2)

: congenital partial or total absence of the skull

Acrania

noun plural

Medical Definition of Acrania (Entry 2 of 2)

in some classifications
: a division of the phylum or subkingdom Chordata comprising the hemichordates, tunicates, and lancelets and including all the chordates without true heads and anterior brains — compare vertebrata

Learn More about acrania

Cite this Entry

“Acrania.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/acrania. Accessed 6 May. 2021.

Style: MLA
MLACheck Mark Icon ChicagoCheck Mark Icon APACheck Mark Icon Merriam-WebsterCheck Mark Icon

Comments on acrania

What made you want to look up acrania? Please tell us where you read or heard it (including the quote, if possible).

WORD OF THE DAY

Test Your Vocabulary

Star Wars Words Quiz

  • cu jedi training
  • The bounty portion of bounty hunters (such as Boba Fett) comes from a Latin word meaning
Name That Thing

Test your visual vocabulary with our 10-question challenge!

TAKE THE QUIZ
Typeshift

Anagram puzzles meet word search.

TAKE THE QUIZ
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!