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abortive failing to achieve a desired end; unsuccessful; fruitless. [3 definitions]
ABO system a classification system for the inherited antigens found on the surface of human red blood cells, which determine compatibility for blood transfusions.
abound to be found or available in a large amount or number. [2 definitions]
about concerning. [12 definitions]
about face a military command to turn and face the opposite direction.
about-face a reversal of one's position or direction, esp. in response to a military command. [3 definitions]
about to ready to; just on the point of.
above at or to a higher place than. [9 definitions]
above all more importantly than anything else. [2 definitions]
aboveboard without tricks, deceit, or concealment.
abovementioned introduced or discussed in an earlier part of a written text. [2 definitions]
ab ovo (Latin) from the egg; from the beginning.
abracadabra a nonsense word thought to produce a magical effect such as the warding off of disaster or disease. [2 definitions]
abradant am abrasive substance. [2 definitions]
abrade to rub away by friction; erode. [4 definitions]
Abraham according to the Old Testament, the first of the postdiluvian patriarchs, father of Isaac, and ancestor of the Hebrews.
Abraham Lincoln the 16th President of the United States (1861-1865), who was Commander-in-Chief of the Union troops during the American Civil War and who signed the Emancipation Proclamation, thus bringing an end to slavery in the United States (b.1809--d.1865).
abranchiate lacking gills.
abrasion a spot or patch that has been scraped, as on the skin. [2 definitions]
abrasive a material or substance used to grind or polish surfaces. [3 definitions]
abreast side by side. [4 definitions]