Branches of Science with Definition in Alphabetical Order Part – 1 ( A – E )
| S. No. | Branch | Definition |
| 1 | Aceology | The study of therapeutics |
| 2 | Acoustics | The science of sound |
| 3 | Actinology | The study of the chemical effects of light |
| 4 | Adenology | The study of glands |
| 5 | Aerodynamics | The study of dynamics of gases |
| 6 | Aerology | The study of atmosphere |
| 7 | Aeronautics | The study of navigation in air or space |
| 8 | Aerostatics | The science of air pressure |
| 9 | Agmatology | The study of fractures |
| 10 | Agrobiology | The study of plant nutrition or soil yields |
| 11 | Agroclimatology | The study of agriculture meteorology |
| 12 | Agroecology | The study of sustainable farming systems |
| 13 | Agrogeology | The study of geology applied to agriculture needs |
| 14 | Agrology | The study of agricultural soils |
| 15 | Agronomics | The study of productivity of land |
| 16 | Algology | The study of algae |
| 17 | Amphibiology | The study of amphibian |
| 18 | Anaesthesiology | The study of anaesthetics |
| 19 | Anatomy | The study of the internal structure of the body |
| 20 | Anemology | The study of winds |
| 21 | Angiology | The study of blood vessels & lymphatics |
| 22 | Angiopathology | The study of diseases blood vessels |
| 23 | Anthropobiology | The study of human biological relationships |
| 24 | Anthropology | The study of humankind |
| 25 | Anthroposociology | The study of the human races |
| 26 | Anthrozoology | The study of animal and human relationships |
| 27 | Aphasiology | The study of speech disorders |
| 28 | Apiology | The study of bees |
| 29 | Arachnology | The study of spiders |
| 30 | Archaeology | The study of excavated artefacts |
| 31 | Areology | The study of Mars |
| 32 | Arthrology | The study of joints |
| 33 | Asthenology | The study of diseases arising from debility |
| 34 | Astrolithology | The study of meteorites |
| 35 | Astronomy | The study of celestial bodies |
| 36 | Astrophysics | The study of behavior of interstellar matter |
| 37 | Astroseismology | The study of star oscillations |
| 38 | Atmology | The science laws and phenomena of aqueous vapour |
| 39 | Audiology | The study of hearing |
| 40 | Auxology | The study of human physical growth |
| 41 | Avionics | The science of electronic devices for aircraft |
| 42 | Bacteriology | The study of bacteria |
| 43 | Balneology | The science of therapeutic use of baths |
| 44 | Barology | The science of weight or gravity |
| 45 | Biology | The study of life |
| 46 | Biometrics | The study of biological measurements |
| 47 | Bionomics | The study of organisms interacting in their environments |
| 48 | Botany | The study of plants |
| 49 | Bromatology | The study of food |
| 50 | Brontology | The scientific study of thunder |
| 51 | Bryology | The study of mosses |
| 52 | Caliology | The study of bird’s nest |
| 53 | Carcinology | The study of crabs and other crustaceans |
| 54 | Cardiology | The study of heart |
| 55 | Carpology | The study of fruit |
| 56 | Cartography | The science of making maps and globes |
| 57 | Catacoustics | The science of echoes or reflected sounds |
| 58 | Cetology | The study of whales and dolphins |
| 59 | Chaology | The study of chaos or chaos theory |
| 60 | Chemistry | The study of properties of substances |
| 61 | Chirology | The medical science of feet |
| 62 | Chorology | The study of spatial distribution of organisms within a particular geographical region |
| 63 | Chronobiology | The study of biological rhythm & cyclical phenomena |
| 64 | Chronometry | The science of accurate time measurement |
| 65 | Climatology | The study of climate |
| 66 | Cometology | The study of of comets |
| 67 | Conchology | The study of shells |
| 68 | Cosmetology | The study of cosmetics |
| 69 | Cosmology | The study of the universe |
| 70 | Craniology | The study of the skull |
| 71 | Criminology | The study of crime and criminals |
| 72 | Cryobiology | The study of organisms, tissues etc at temperatures below which they normally function |
| 73 | Cryogenics | The study of life under cold conditions |
| 74 | Cryptology | The study of codes |
| 75 | Cybernetics | Study of communications & automatic control systems |
| 76 | Cynology | The scientific study of dogs |
| 77 | Cytology | The study of living cells |
| 78 | Cytopathology | The study of diseases of cells |
| 79 | Dactylography | The study of fingerprints |
| 80 | Demology | The study of human behavior |
| 81 | Dendrochronology | The science of dating environmental variations by means of the comparative study of the growth rings in trees |
| 82 | Dendrology | The study of trees |
| 83 | Dermatology | The study of skin related disease |
| 84 | Desmology | The study of ligaments & sinews |
| 85 | Dioptrics | The study of light refraction |
| 86 | Diplomatics | The science of deciphering ancient writings and texts |
| 87 | Dysgenics | The study of operation of factors that cause degeneration in offspring |
| 88 | Eccrinology | The study of glands excretion and secretion |
| 89 | Ecology | The study of environment |
| 90 | Economics | The study of material wealth |
| 91 | Edaphology | The study of influence of soils on living things |
| 92 | Electrochemistry | The study of relationship between electricity and chemicals |
| 93 | Electrology | The study of electricity |
| 94 | Electrostatics | The study of static electricity |
| 95 | Embryology | The study of embryos |
| 96 | Emetology | The study of vomiting |
| 97 | Endemiology | The study of endemic diseases |
| 98 | Endocrinology | The study of glands |
| 99 | Entomology | The study of insects |
| 100 | Entozoology | The study of parasites that live inside other organisms |
| 101 | Enzymology | The study of enzymes |
| 102 | Ephebiatrics | The branch of medicine dealing with adolescence |
| 103 | Epidemiology | The study of diseases; epidemics |
| 104 | Epileptology | The study of epilepsy |
| 105 | Epistemology | The study of grounds of knowledge |
| 106 | Eremology | The study of deserts |
| 107 | Ergonomics | The study of the efficiency of people in the workplace |
| 108 | Eschatology | The study of death |
| 109 | Ethnogeny | The study of origin of races or ethnic groups |
| 110 | Ethnology | The study of cultures |
| 111 | Ethology | The study of animal behavior with emphasis on the behavioural patterns that occur in natural environments |
| 112 | Etiology | The study of causes of diseases |
| 113 | Euthenics | The science concerned with improving living conditions |
| 114 | Exobiology | The study of causes of extraterrestrial life |
Continued…
