| ABO blood group | <haematology> The major human blood type system which describes the oligosaccharide glycoprotein antigens found on the surface of human blood cells. According to the type of antigen present, a person may be assigned a blood type of A, B, AB or O. A second type of antigen, the Rh factor, renders a positive or negative blood type. The ABO blood group system is important because it determines who can donate blood to or accept blood from whom. Type A or AB blood will cause an immune reaction in people with type B blood and type B and AB blood will cause a reaction in people with type A blood. Conversely, type O blood has no A or B antigens, so people with type O blood are universal donors. And since AB blood already produces both antigens, people who are type AB can accept any of the other blood types without suffering an immune reaction. (04 Jul 1999) |
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| ABO haemolytic disease of the newborn | Erythroblastosis foetalis due to maternal-foetal incompatibility with respect to an antigen of the ABO blood group; the foetus possesses A or B antigen which is lacking in the mother, and the mother produces immune antibody which causes haemolysis of foetal erythrocytes. (05 Mar 2000) |
| ABO incompatibility | <haematology> A type of blood incompatibility, found rarely. Transfusion reactions may occur as a result of such incompatibility. (27 Sep 1997) |
| abohm | Electromagnetic unit of resistance equal to 10-9 ohm. (05 Mar 2000) |
| aboiement | Rarely used term for the involuntary production of abnormal sounds, as seen in Gilles de la Tourette syndrome. Origin: Fr. Barking, yelping (05 Mar 2000) |
| abolish | 1. To do away with wholly; to annul; to make void; said of laws, customs, institutions, governments, etc.; as, to abolish slavery, to abolish folly. 2. To put an end to, or destroy, as a physical objects; to wipe out. "And with thy blood abolish so reproachful blot." (Spenser) "His quick instinctive hand Caught at the hilt, as to abolish him." (Tennyson) Synonym: To Abolish, Repeal, Abrogate, Revoke, Annul, Nullify, Cancel. These words have in common the idea of setting aside by some overruling act. Abolish applies particularly to things of a permanent nature, such as institutions, usages, customs, etc.; as, to abolish monopolies, serfdom, slavery. Repeal describes the act by which the legislature of a state sets aside a law which it had previously enacted. Abrogate was originally applied to the repeal of a law by the Roman people; and hence, when the power of making laws was usurped by the emperors, the term was applied to their act of setting aside the laws. Thus it came to express that act by which a sovereign or an executive government sets aside laws, ordinances, regulations, treaties, conventions, etc. Revoke denotes the act or recalling some previous grant which conferred, privilege, etc.; as, to revoke a decree, to revoke a power of attorney, a promise, etc. Thus, also, we speak of the revocation of the Edict of Nantes. Annul is used in a more general sense, denoting simply to make void; as, to annul a contract, to annul an agreement. Nullify is an old word revived in this country, and applied to the setting of things aside either by force or by total disregard; as, to nullify an act of Congress. Cancel is to strike out or annul, by a deliberate exercise of power, something which has operative force. Origin: F. Abolir, L. Abolere, aboletum; ab + olere to grow. Cf. Finish. Source: Websters Dictionary (01 Mar 1998) |
| aboma | <zoology> A large South American serpent (Boa aboma). Source: Websters Dictionary (01 Mar 1998) |
| abomasitis | Inflammation of the abomasum. (05 Mar 2000) |
| abomasum | <anatomy> The fourth stomach of the cow. The abomasums of suckling calves are used as a source of rennet, a rennin-containing commercial enzyme preparation used to make cheese. (06 May 1997) |
| abomasus | <anatomy> The fourth or digestive stomach of a ruminant, which leads from the third stomach omasum. See Ruminantia. Origin: NL, fr. L. Ab + omasum (a Celtic word). Source: Websters Dictionary (01 Mar 1998) |
| aborad | In a direction away from the mouth; opposite of orad. Origin: L. Ab, from, + os (or-), mouth (05 Mar 2000) |
| aboral | <zoology> Situated opposite to, or away from, the mouth. Origin: L. Ab. + E. Oral. Source: Websters Dictionary (01 Mar 1998) |
| aboriginal | 1. An original inhabitant of any land; one of the aborigines. 2. An animal or a plant native to the region. "It may well be doubted whether this frog is an aboriginal of these islands." (Darwin) 1. First; original; indigenous; primitive; native; as, the aboriginal tribes of America. "Mantled o'er with aboriginal turf." 2. Of or pertaining to aborigines; as, a Hindoo of aboriginal blood. See: Aborigines. Source: Websters Dictionary (01 Mar 1998) |
| aborigines | 1. The earliest known inhabitants or indigenous individuals of a country; native races. 2. The original fauna and flora of a geographical area Origin: L. Aborigines; ab + origo, especially the first inhabitants of Latium, those who originally (ab origine) inhabited Latium or Italy. See Origin. Source: Websters Dictionary (01 Mar 1998) |
| abort | 1. To miscarry; to bring forth young prematurely. 2. <biology> To become checked in normal development, so as either to remain rudimentary or shrink away wholly; to become sterile. Origin: L. Abortare, fr. Abortus, p. P. Of aboriri; ab + oriri to rise, to be born. See Orient. Source: Websters Dictionary (01 Mar 1998) |
| abortively |
in an unfruitful manner
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| abdominoplasty |
cosmetic surgery of the abdomen to remove wrinkles and tighten the skin over the stomach
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| abdominocentesis |
centesis of the belly to remove fluid for diagnosis
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| abulia |
a loss of will power
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| abdominovesical |
of or relating to the abdomen and the urinary bladder
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| AB | an autonomous province of Georgia on the Black Sea |
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| AB | a Circassian language spoken by the Abkhaz people |
| AB | gradually deprive (infants) of mother's milk |
| AB | the act of substituting other food for the mother's milk in the diet of a child or young mammal |
| AB | the cessation of lactation |
| AB | remove an organ or bodily structure by surgery |
| AB | wear away through erosion or vaporization |
| AB | removed or taken away by cutting or erosion or melting or evaporation |
| AB | made smaller or less by melting or erosion or vaporization |
| AB | surgical removal of a body part or tissue |
| AB | the erosive process that reduces the size of glaciers |
| AB | the case indicating the agent in passive sentences or the instrument or manner or place of the action described by the verb |