planctus PLAHNK-toos Your browser does not support the audio element. [ Latin , lament ] Definition Medieval style of song and poetry of a lamenting character. They were sung both in Latin and in the vernacular (common language), treated both religious and secular subjects, and were popular throughout Europe. Share Share on Facebook (opens in a new tab) Share on X (opens in a new tab) Last Updated: 2013-02-14 19:24:41