SINCE 1828

An Encyclopædia Britannica Company

Medical Dictionary

transseptal

adjective trans·sep·tal

variants: also

transeptal

\-ˈsep-t^əl\play

Medical Definition of transseptal

1: passing across a septum transseptal fibers between teeth
2: passing or performed through a septum transseptal cardiac catheterization

Seen and Heard

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

show

WORD OF THE DAY

malleable

play

capable of being altered or controlled

Words at Play

Plural Words With Multiple Spellings

Multiple spellings for "multiple" words.

alt-5924736949123

Does This Common Computer Term Actually Reference Shoes?

These reboots were made for walking

alt-592453dea3986

Read on to Become Part of the Dictionary 'Illuminati'

Secrets will be revealed.

alt-592333459542f

How 'Namaste' Entered The English Language

Ask the Editors

Is it wrong to use 'decimate' to mean 'destroy'?

Language changes

The Serial Comma

Why don't they call it the Merriam-Webster comma?

video-irregardless-grammar-peeve-blend-of-the-synonyms-irrespective-and-regardless

Irregardless

It is in fact a real word (but that doesn't mean you should use it).

video-moose-goose-weird-plurals

Weird Plurals

One goose, two geese. One moose, two... moose. What's up with that?

Word Games

peter-bruegel-tower-of-babel-painting

Where in the World? A Quiz

Do you know what languages these words come from?

Take the quiz

wide-eyed-dog-smelling-rose

What's that Smell?! Quiz

Words for odors and such...

Take the quiz

Name That Thing

Name That Thing

Test your visual vocabulary with our 10-question challenge!

Take the quiz

SCRABBLE® Sprint

SCRABBLE® Sprint

SCRABBLE® fans, sharpen your skills!

Play the game