transcription, транскрипция: [ ˈel-ˈtrip-tə-ˌfan ]
noun
Date: 1949
: the levorotatory form of tryptophan that is a precursor of serotonin and was used formerly as a dietary supplement especially to promote sleep and relieve depression
L-TRYPTOPHAN
Meaning of L-TRYPTOPHAN in English
Merriam-Webster's Collegiate English vocabulary. Энциклопедический словарь английского языка Merriam Webster. 2003