Index of letter A
| a-1 | Not or without. |
| a-2 | Towards, of, in, into or at; marking some ongoing process or state; movement onwards or away. |
| -a1 | Forming singular words of various types. |
| -a2 | The plural of certain nouns of Latin or Greek origin. |
| -a3 | Informal terms in spoken English. |
| ab- | Off, away, or from. |
| abdomin(o)- | The abdomen. |
| -able | Able to be. |
| abs- | See ab- |
| -ac | Forming adjectives and nouns. |
| ac- | See ad- |
| -acal | See -ac |
| acanth(o)- | Spiny or thorny. |
| acar(o)- | A mite or tick. |
| -acea | Groups of animals. |
| -aceae | Families of seed-bearing plants. |
| -acean | See -acea |
| -aceous | Forming adjectives. |
| acet(o)- | Acetic acid or the acetyl group. |
| acid(o)- | Acid; sharp or sour. |
| -acious | Inclined to, given to, or having as a capacity. |
| acoust(o)- | Sound or hearing. |
| acr(o)- | A tip, height, or extremity. |
| acryl(o)- | Acrylic. |
| actin(o)- | A ray or beam. |
| -acusis | A condition of the hearing. |
| -acy | See -cy |
| ad- | Motion or direction to; reduction or change into; addition, increase, or intensification. |
| -ad1 | Collective numerals; nymphs. |
| -ad2 | Indicating a direction towards some part of the body. |
| -ade | Denoting an action, its result, or something associated with it. |
| aden(o)- | A gland. |
| adip(o)- | Fat or fatty tissues. |
| -ado | Forming a variety of words based on Portuguese, Spanish, or Italian originals. |
| adren(o)- | The adrenal glands. |
| -ae | Forming plurals. |
| -aemia | A substance present in the blood, especially in excess. |
| aer(o)- | Air or another gas; the atmosphere; aircraft. |
| af- | See ad- |
| afore- | Before or previously. |
| Afro- | Africa; African and … |
| ag- | See ad- |
| -age | Forming nouns. |
| -agogue | Leading or promoting. |
| -agra | Pain in some part of the body. |
| agro- | Farming; cultivation. |
| -aholic | A person excessively fond of something. |
| -aire | A person characterized by or linked to the idea in the stem. |
| -akusis | See -acusis |
| al- | See ad- |
| -al1 | Forming adjectives and some nouns. |
| -al2 | An aldehyde. |
| alb- | White or bright. |
| aldo- | An aldehyde. |
| -ales | Orders of plants. |
| -algia | Pain, usually in a specified part of the body. |
| algo- | Pain. |
| -alia | A collection or group. |
| -ality | See -ity |
| all(o)- | Other; different. |
| alumin(o)- | Aluminium. |
| -ama | See -orama |
| ambi- | On both sides; around. |
| amid(o)- | The CONH2- group in chemical compounds. |
| amino- | The amine group, NH2—. |
| amnio- | The amnion. |
| amph(i)- | Variously two, both, on both sides, or around. |
| amyl(o)- | Starch. |
| -an | See -ian |
| an- | See a-1, ad-, and ana- |
| -ana | Things associated with a person, place, or field of interest. |
| an(a)- | Variously up, back, or again. |
| -ance | A state or quality; a process or action. |
| anchylo- | See ankylo- |
| -and | A person or thing to be treated in a specified way. |
| andr(o)- | Male or maleness. |
| -androus | Maleness. |
| -ane1 | Saturated straight-chain (aliphatic) hydrocarbons. |
| -ane2 | Forming adjectives. |
| anem(o)- | The wind. |
| -aneous | See -ous |
| angi(o)- | Blood or seed vessels. |
| -angium | A container. |
| Anglo- | English or British; English or British and … |
| anis(o)- | Unequal, asymmetrical, dissimilar. |
| ankylo- | Bent or crooked; stiff or fixed. |
| -ant | Forming adjectives and nouns. |
| ante- | Before or preceding. |
| antero- | Nearer the front of the body; forward in time. |
| anth(o)- | A flower or flowers. |
| anthrac(o)- | Coal or carbon; a carbuncle. |
| anthrop(o)- | Human, or of a human being. |
| -anthropy | Human, or humankind. |
| ant(i)- | Acting against, resisting, or opposing something; the opposite or reverse of something. |
| ap- | See ad- |
| apic(o)- | A point or apex. |
| apo- | Away from; separate from. |
| après- | A period following some activity. |
| aqua- | Water. |
| ar- | See ad- |
| -ar1 | Forming adjectives. |
| -ar2 | Forming nouns. |
| arachn(o)- | A spider or spiders. |
| -arama | See -orama |
| arbor(i)- | A tree or trees. |
| -arch | See -archy |
| arch- | Chief; principal; pre-eminent of its kind. |
| archaeo- | Ancient or prehistoric times. |
| arche- | See arch- |
| -archy | Government; rule of a particular type; a chief or ruler. |
| -ard | Forming nouns. |
| areo- | The planet Mars. |
| argent(o)- | Silver. |
| -arian | Forming adjectives and corresponding nouns. |
| -arious | Connected with; pertaining to. |
| -arium | A place or container connected with, or employed for, some purpose. |
| -aroo | See -eroo |
| arsen(o)- | Arsenic. |
| -art | See -ard |
| arteri(o)- | An artery. |
| arthr(o)- | A joint. |
| -ary1 | Forming nouns. |
| -ary2 | Forming adjectives. |
| as- | See ad- |
| asc(o)- | A bag or sac. |
| -ase | An enzyme. |
| -asis | A disease or other medical condition. |
| -ast | A person connected with a pursuit or activity. |
| -aster | Inferior; a poor imitation. |
| astr(o)- | A star or other celestial body; outer space; star-shaped. |
| at- | See ad- |
| -ata | See -a2 |
| -atable | See -ate3 |
| -ate1 | Forming nouns. |
| -ate2 | Forming adjectives. |
| -ate3 | Forming verbs. |
| -ateria | See -teria |
| ather(o)- | An atheroma. |
| -athon | An event long in duration, usually for fund-raising purposes. |
| -ati | Groups of people. |
| -atic | Forming adjectives, and some nouns. |
| -atile | Possibility, potential, or ability. |
| -ation | An action, or an instance of an action. |
| -ative | Characteristic or predisposed. |
| -ator | See -or1 |
| -atory | See -ory1 and -ory2 |
| atto- | In units of measurement, a factor of 10-18. |
| audi(o)- | Hearing or sound. |
| aur(i)- | Gold. |
| Austro-1 | Austria; Austria and … |
| Austr(o)-2 | Australia; Australia and …; southern. |
| aut(o)-1 | Self; oneself; by itself. |
| auto-2 | An automobile or motor vehicle. |
| aux(o)- | Growth or increase. |
| avi- | A bird or birds; flight. |
| axo- | An axis. |
| az(o)- | Nitrogen; the chemical radical -N=N-. |
| -azole | See -ole1 |
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