Longman Dictionary of Contemporary English homepage

Date: 1800-1900
Origin: amine type of chemical compound (19-21 centuries), from ammonia

amino acid

 noun
     
Related topics: Biology
a‧mi‧no ac‧id [countable]
HB one of the substances that combine to form proteins
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

Dictionary pictures of the day
Do you know what each of these is called?
What is the word for picture 1? What is the word for picture 2? What is the word for picture 3? What is the word for picture 4?
Click on any of the pictures above to find out what it is called.

Explore our topic dictionary

Browse the dictionary