n.
Pronunciation: h ī - ' dräk-s ə -l ə - ˌ m ē n, ˌ h ī - ˌ dräk- ' si-l ə - ˌ m ē n
Function: noun
Etymology: International Scientific Vocabulary
Date: 1869
: a colorless odorless nitrogenous base NH 3 O that resembles ammonia in its reactions but is less basic and that is used especially as a reducing agent