Quantcast
Merriam-Webster Logo
  • Dictionary
  • Thesaurus
  • Medical
  • Scrabble
  • Spanish Central
  • Learner's Dictionary

Medical Dictionary

1

alpha

play
noun al·pha \ˈal-fə\

Medical Definition of alpha

  1. 1:  the 1st letter of the Greek alphabet—symbol Α or α

  2. 2:  alpha particle

  3. 3:  alpha wave




2

alpha

adjective al·pha

Medical Definition of alpha

  1. 1:  of or relating to one of two or more closely related chemical substances <the alpha chain of hemoglobin> <α-yohimbine>—used somewhat arbitrarily to specify ordinal relationship or a particular physical form, especially one that is allotropic, isomeric, stereoisomeric, or sometimes polymeric (as in α-D-glucose)

  2. 2:  closest in position in the structure of an organic molecule to a particular group or atom; also :  occurring at or having a structure characterized by such a position <α-substitution>



Variants of alpha

or α-

Learn More about alpha


Seen and Heard

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

WORD OF THE DAY

marked by propriety and good taste

Get Word of the Day daily email!

WORD GAMES

Take a 3-minute break and test your skills!

image567572573

Which of these is a synonym of unctuous?

maudlin angry oily prompt
Name That Thing

Test your visual vocabulary with our 10-question challenge!

TAKE THE QUIZ
SCRABBLE® Sprint

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

TAKE THE QUIZ