mystic
Concise Oxford English Dictionary © 2008 Oxford University Press:
mystic/ˈmɪstɪk/
▶noun a person who seeks by contemplation and self-surrender to attain unity with the Deity or the absolute, and so reach truths beyond human understanding. ▶adjective another term for mystical.
– origin ME: from OFr. mystique, or via L. from Gk mustikos, from mustēs ‘initiated person’ from muein ‘close the eyes or lips’, also ‘initiate’.
'mystic' also found in these Oxford entries:

