plural of pH indicator

A float used by anglers to tell when a fish has taken the bait

(algebra, of a group) Such that each of its nontrivial, finitely generated subgroups maps homomorphically onto ℤ.

Any device for comparing a physical property of two objects, or an object with a standard.

A phenomenon that generally occurs in advance of a more important phenomenon, aiding in its prediction.

plural of leading indicator

plural of price index

plural of indicative mood

plural of heat index

(aviation) A two-letter indicator used in fare construction to indicate the basic routing that the fare applies to.