Merriam-Webster Logo
SINCE 1828
Menu
×

An Encyclopædia Britannica Company

See What's Trending Now See More Trending Words

Medical Dictionary

harmaline

noun har·ma·line \ ˈhär-mə-ˌlēn \

medical Definition of harmaline

:a hallucinogenic alkaloid C13H14N2O found in several plants (Peganum harmala of the family Zygophyllaceae and Banisteriopsis spp. of the family Malpighiaceae) and used in medicine as a stimulant of the central nervous system

Explore Merriam-Webster

alt-59e60c9d3e5ea
Trending: McCain: Half-Baked, 'Spurious' Nationalism
tycoon
17 English Words that Come From Japanese
alt-59e50f5a357b4
'Spox' May Go On The Record
knupfer-painting-solon-before-croesus
Forms of Government Quiz

Seen and Heard

What made you want to look up harmaline? 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!

WORD OF THE DAY

euphony

play

pleasing or sweet sound

Get Word of the Day daily email!

TRENDING NOW

  1. spurious of a deceitful nature or quality

  2. righteous We provide an assortment of definitions

  3. Kafkaesque 'A nightmarish quality'

  4. mike "microphone"

  5. moron “a very stupid person”

SEE ALL

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

alt-59e50f5a357b4
'Spox' May Go On The Record

From newsroom lingo to the mainstream

alt-59e506c5c02ae
C'mon, Of Course 'Myriad' Is a Noun

For a myriad of reasons

alt-59e12097b419d
'Gamut' and 'Gambit' (and 'Gauntlet' Too)

Know when to use (or run) each.

tycoon
17 English Words that Come From Japanese

Some borrowed words don't get returned

Ask the Editors

video-title-words-of-the-year-1066
Words of the Year: 1066

Or, Why Pig Meat is Called 'Pork' and Cow Meat is Called 'Beef'

payday
How Often Is 'Biweekly'?

Don't get us started on 'bimonthly'

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

knupfer-painting-solon-before-croesus
Forms of Government Quiz

Name that government! Or something like that.

Take the quiz
rembrandt-painting-a-young-scholar-and-his-tutor
Original Meanings Quiz

A quiz for the pedantic and those annoyed by them!

Take the quiz
Spell It
Spell It

Can you spell these 10 commonly misspelled words?

Take the quiz
SCRABBLE® Sprint
SCRABBLE® Sprint

SCRABBLE® fans, sharpen your skills!

Play the game