Online Biology Dictionary

A dictionary of biological and medical terminology


Edited by Eugene M. McCarthy, PhD Genetics
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Online Biology Dictionary is a free, concise, illustrated dictionary of biology and medicine. The entries are listed alphabetically, which lets you to look up biology terms even if you're not sure about their spellings (or click here to use the dictionary's automated term finder). Terminology is added to this dictionary on an ongoing basis. Existing definitions and explanations are also periodically updated to keep up with current trends and technology. To find the meaning of a term, click on its first letter here:

BIOLOGICAL TERMINOLOGY STARTING WITH:
  A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U-Z  
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Notice: The automated terminology finder has been moved to a separate web page. To look up biology terms, please click here to access the finder at its new location.



Frequently-viewed Terms:    
Alleles →     Autotroph →     Biology →     Biotic →     Branches of Biology →    
Cell →     Cell membrane →     Cilia →     Concentration gradient →     Cytoplasm →    
Diffusion →     Diploid →     Ecosystem →     Enzyme →     Fluid mosaic model →    
Gamete →     Gene →     Habitat →     Haploid →     Homolog →    
Homeostasis →     Hypertonic→     Hypotonic→     Leukocytes →     Lytic cycle →    
Meiosis →     Mitochondria →     Mitosis →     Natural selection →     Nucleus →    
Nulliparity →     Organism →     Osmosis →     Photosynthesis →     Plasma membrane →    
Ribosomes →     Solute →     Solution →     Species →     Standard deviation →    




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