(obsolete) A needle used for inserting a rowel or seton.

plural of needcessity

(dialect, nonstandard) necessity

(chiefly US, South Africa, Canada, euphemistic, interrogative) Used to ask if one's interlocutor needs to urinate or defecate.

Do not seek advice from a biased party.

plural of hour of need

(idiomatic) the time when help is most needed

To cause the hand of a dial indicator to reach the highest measurement, due to reaching the maximum measurable speed, pressure, etc.

The practice among intravenous drug users by which a needle or syringe is shared by multiple individuals to administer intravenous drugs, potentially leading to transmission of certain infectious diseases.

A place or service that allows intravenous drug users to obtain new hypodermic needles at little or no cost, often in exchange for used ones.