Merriam-Webster Logo
SINCE 1828
Menu
dictionary thesaurus

pseudotachylyte

noun
pseu·​do·​tachylyte | \ "+\

Definition of pseudotachylyte

: a rock consisting of glass in which are included numerous fragments of the adjacent rock and which is supposed to have been formed by the partial fusion of crush breccia or mylonite

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!

History and Etymology for pseudotachylyte

International Scientific Vocabulary pseud- + tachylyte

Keep scrolling for more

Learn More about pseudotachylyte

Share pseudotachylyte

Statistics for pseudotachylyte

Look-up Popularity

Comments on pseudotachylyte

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

Show Comments  Hide Comments 

WORD OF THE DAY

purview

Listen to the pronounciation of purview

the range of authority or knowledge

Get Word of the Day daily email!

Test Your Vocabulary

Original Meanings Quiz

  • rembrandt-painting-a-young-scholar-and-his-tutor
  • Which of the following is the earliest known sense of the word awe?
True or False

Test your knowledge - and maybe learn something along the way.

TAKE THE QUIZ
Add Diction

Test Your Knowledge - and learn some interesting things along the way.

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!

Words at Play

Ask the Editors

Word Games