Merriam-Webster Logo
SINCE 1828
Menu
dictionary thesaurus

mastax

noun mas·tax \ ˈmaˌstaks \

Definition of mastax

plural -es
1 : the pharynx of a rotifer usually containing several horny pieces most commonly consisting of an incus and mallei
2 : the lore of a bird

There's more!

Love words? You must — there are over 200,000 words in our free online dictionary, but you are looking for one that’s only in the Merriam-Webster Unabridged Dictionary.

Start your free trial today and get unlimited access to America's largest dictionary, with:

  • More than 250,000 words that aren't in our free dictionary
  • Expanded definitions, etymologies, and usage notes
  • Advanced search features
  • Ad free!
Already a subscriber? Log in.

Origin and Etymology of mastax

New Latin, from Greek, mouth, jaws; akin to Greek masasthai to chew

Seen and Heard

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

show hide

Love words? Need even more definitions?

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

Love words? Need even more definitions?

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

Words at Play

Ask the Editors

Word Games