alkanet
European perennial herb (Alkanna tinctoria) having cymes of blue flowers
and red roots. The red dye extracted from the root. Plants of the
Eurasian genus Anchusa, having blue or violet flowers grouped on
elongated cymes.

allyl
Univalent, unsaturated organic radical C3H5.

aloin
Bitter, yellow crystalline compound from aloe, used as a laxative.
alum
Double sulfates of a trivalent metal such as aluminum, chromium, or iron
and a univalent metal such as potassium or sodium, especially aluminum
potassium sulfate, AlK(SO4)2 12H2O, widely used in industry as
clarifiers, hardeners, and purifiers and medicinally as topical
astringents and styptics.

anemonin
Acrid poisonous compound containing two lactone groups; obtained from
plants of the genus Anemone and genus Ranunculus, containing the
buttercups.

aneurysm (aneurism)
Localized, blood-filled dilatation of a blood vessel caused by disease
or weakening of the vessel wall.

animadversion
Strong criticism. Critical or censorious remark: