Lowest Female Singing Voice
This page is the CodyCross answer for the clue below from Physics, Group 1899, Puzzle 5 (Spectral Lines).
Question is: Lowest Female Singing Voice
and the answer is: CONTRALTO
Word Meaning:
CONTRALTO — (music) The lowest female voice or voice part, falling between tenor and mezzo-soprano. The terms contralto and alto refer to the same musical pitch range, but among singers, the term contralto is reserved for female singers; the equivalent male form is counter-tenor. Originally the contratenor altus was a high countermelody sung against the tenor or main melody.
Definitions from Wiktionary.