"occulter" in the adjective sense
1. occult
hidden and difficult to see
"an occult fracture"
"occult blood in the stool"
2. mysterious, mystic, mystical, occult, secret, orphic
having an import not apparent to the senses nor obvious to the intelligence beyond ordinary understanding
"mysterious symbols"
"the mystical style of Blake"
"occult lore"
"the secret learning of the ancients"
Source: WordNet® (An amazing lexical database of English)
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