Sindarin 

minlamad

noun. 'first voiced' or 'first-echoing', alliterative (?) verse mode (minlamad thent/estent)

The word is not translated by Tolkien. For a discussion of its probable meaning, refer to Tolkien's Legendarium p. 121-122

Sindarin [UT/146, WJ/311, WJ/315] Group: SINDICT. Published by