noun: (medicine) Abbreviation of practical nurse. [A person who is certified to provide custodial care such as help in walking, bathing, and feeding.]
noun: (Malaysia, politics, uncountable) Initialism of Perikatan Nasional (“National Alliance”).
noun: (astronomy) Initialism of planetary nebula. [(astronomy) A nebulosity surrounding a dying red giant, consisting of material expelled by the star.]
