(astronomy) Abbreviation of pulsar. / (aviation) Initialism of primary surveillance radar. / Initialism of police service representative, an LAPD dispatcher. / Initialism of pre-sentence report.

A passerine bird, Emberiza citrinella, of western Eurasia, which is mainly yellow in colour. / (US) The northern flicker, Colaptes auratus. / A native or resident of the American state of Alabama.

(uncountable, organic chemistry) A tricyclic aromatic heterocycle, dibenzopyridine, obtained from coal tar; it is used in the manufacture of dyes and drugs

(obsolete, now only nonstandard, rare) Alternative spelling of chalk