(chemistry) A rule in chemistry that states that the sum of the hydrogen valence and the maximum oxygen valence is equal to eight.

plural of Abel test

(chemistry, usually capitalized) A test to determine the flash point of a volatile oil. / (chemistry, usually capitalized) A test for the stability of smokeless powder and similar explosives.

(historical) A member of a 16th-century Anabaptist sect, follower of the Zwickau prophets (and specially of Thomas Storch), who believed that any kind of knowledge (even basic reading and writing) would keep one from reaching obtaining salvation.

plural of aberrant conduction

(medicine) A heart condition where the electrical stimulus travels via an abnormal pathway.

(optics) Alternative form of spherical aberration

A deviation in mental function.

(optics) Deviation from the correct point of focus measured perpendicular to the axis.

(optics) Deviation from the correct point of focus measured parallel to the axis.