[se.rac] n [F serac, lit., a kind of white cheese, fr. ML seracium whey, fr. L serum whey--more at serum] (1860): a pinnacle, sharp ridge, or block of ice among the crevasses of a glacier
SERAC
Meaning of SERAC in English
Merriam-Webster English vocab. Английский словарь Merriam Webster. 2012