| A | B |
| abbé | title for superior of a Fr.monastery |
| acequia | irrigation canal |
| acoustooptics | science of the interaction of acoustic and optical phenomena |
| adumbration | sketchy outline; foreshadow; disclose partially |
| advection | change in properties such as temp, air mass |
| agraffe, agrafe | a hook-and-loop arrangement used as a clasp; cramp iron for holding stones together |
| aiguille | sharp, pointed mountain peak; needle-shaped masonry drill |
| alliaceous | resembling onion, garlic, or similar plants of allium |
| amarelle | type of sour cherry having pale red fruit with colorless or nearly colorless juice |
| ampullae; ampulla | nearly round bottle with 2 handles used for wine, oil or perfume; sm. canal in the ear |
| amygdaline | relating to or resembling an almond |
| anechoic | not having nor producing echoes |
| antisepsis | destruction of disease-causing microorganisms to prevent infection |
| antitussive | capable of relieving or suppressing coughing |
| apophasis | allusion to something by denying that it will be mentioned |
| appetence | a strong craving or desire; a tendency; natural attraction |
| Archeozoic, Archaeozoic | belonging to or designating the earlier of 2 divisions of the Precambrian era |
| arrogate | to take or claim for oneself without right; appropriate |
| asquint | with a sidelong glance |
| astasia | inability to stand because of motor incoordination |
| ataraxia | peace of mind or emotional tranquillity; calmness |
| autochthonous | originating where found; indigenous |
| avirulent | not virulent; not likely to cause disease |
| baccate | resembling a berry in texture or form; bearing berries |
| bandoneon | small accordion especially popular in Latin Am. |
| bedizened | to ornament or dress in a showy or gaudy manner |
| besom | a bundle of twigs attached to a handle used as a broom |
| bobolink | an American migratory songbird; reedbird; black, white and yellow |
| bouclé/boucle | type of yarn usually 3-ply; one thread looser for textured cloth |
| braceros | a Mexican laborer permitted to enter the US to work for a limited period in ag |
| brevet | a commission promoting a military officer in rank without an increase in pay. |