ophicleide
Concise Oxford English Dictionary © 2008 Oxford University Press:
ophicleide /ˈɒfɪklʌɪd/
▶noun an obsolete bass brass instrument with keys.
– origin C19: from Fr. ophicléide, from Gk ophis ‘serpent’ + kleis, kleid- ‘key’.
'ophicleide' also found in these Oxford entries:

