- Learn English
-
Learn grammar
-
List of words
-
Study your cards
-
Hang On, Man!
-
Audio Books
-
More apps
- Recent searches
-
hug
-
countenance
-
over
-
conductor
-
years
-
equally
-
acetabulum
-
browsing
-
dribble
-
set off
- Hide translation
serotonin
serotonin /sɝəˈtoʊnɪn/
noun
-
A neurotransmitter involved in e.g. sleep and depression and memory
(
5-hydroxytryptamine
, serotonin
)
a neurotransmitter involved in e.g. sleep and depression and memory