(often derogatory) An in-depth article that discusses a topic thoroughly and elaborates the writer's point of view, to inspire deep thought related to the article's subject.

A traffic intersection in the West End of London, having connections with Piccadilly, Regent Street, Shaftesbury Avenue, Haymarket, Coventry Street and Glasshouse Street; proverbially visualised as being very busy with people.

Piccadilly, a street running from Hyde Park Corner to Piccadilly Circus / the surrounding area

(phonology) A phonemic merger where the vowels in "pin" and "pen" are pronounced the same before /n/ and /m/, making "pin" and "pen" homonyms.

A narrow hole drilled or punched into a surface, to facilitate the insertion of a wider screw, nail, drill bit, or other boring tool.

Part of clevis fastener that allows rotation of the connected parts about the axis of the pin. A clevis pin consists of a head, shank and hole. The hole passes through the shank at the opposite end of the pin from the head. A cotter pin or similar through the hole keeps the clevis pin in place.

plural of pipe cleaner

(Britain) A shortsheeted bed in which a sheet is folded back on itself halfway down as a practical joke so that the victim cannot get into it.

(organic chemistry) A mixture of terpenoid hydrocarbons that is the principal component of essential oils obtained from various species of Pinus; it includes pinene, carene and menthadiene.

a mixture of monoterpene alcohols obtained from various species of Pinus, rich in α-terpineol