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optic nerve head [optic nerve heads]▼◼◼◼noun[UK: ˈɒp.tɪk nɜːv hed] [US: ˈɑːp.tɪk ˈnɝːv ˈhed]
optic disc [optic discs]▼◼◼◻noun[UK: ˈɒp.tɪk dɪsk] [US: ˈɑːp.tɪk ˈdɪsk]
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