endocrinology
Concise Oxford English Dictionary © 2008 Oxford University Press:
endocrinology /ˌɛndəʊkrɪˈnɒlədʒi/
▶noun the branch of physiology and medicine concerned with endocrine glands and hormones.
– derivatives
endocrinological adjective,
endocrinologist noun.
endocrinological adjective,
endocrinologist noun.
'endocrinology' also found in these Oxford entries:

