An archaic medical or anatomical term for an instrument or substance applied to the neck area, or relating to neck structures.
From Latin 'collum' (neck) + '-arium' (place or instrument for), a suffix that forms nouns denoting instruments, places, or things associated with the preceding root. Largely obsolete in modern usage.
Medieval and Renaissance medical texts are full of these '-arium' and '-oria' terms for obscure remedies and instruments—'collunarium' is one of those wonderfully specific old medical words that probably referred to some long-forgotten poultice or neck brace.
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