The imprint upon the surface of a body of water that is made by a feeding trout, indicative by its form of the feeding behavior of the fish.

A representation of a number in terms of powers of a base, such as the representation of 1234 as 4⨯16²+13⨯16+2⨯16⁰ or the representation of 2345 as 2000+300+40+5.

(computing) A control character traditionally used to cause the printer to eject the current page of output and start a new page, more recently equivalent to a carriage return.

The basic form of a word used as a dictionary headword.

(databases) Any of various forms of a relational database providing criteria for determining a table's degree of vulnerability to logical inconsistencies and anomalies.

(grammar) A word that substitutes for words, phrases, clauses, or sentences, whose meaning is recoverable in context.

(astronomy) Describing a region of space in which new stars are being formed

Behaviour which is contrary to social expectations, which is inappropriate or rude.

The basic form of a word used as a dictionary entry (of any part of speech, but especially of a verb).

Of recent origin.