Correct spelling for the English word "holzin" is [hˈɒlzɪn], [hˈɒlzɪn], [h_ˈɒ_l_z_ɪ_n] (IPA phonetic alphabet).
The term "holzin" is not found in any recognized dictionary. It is possible that this word is misspelled or a made-up term. Consequently, it does not have an established definition. If there is a specific context in which this word is being used, such as a unique jargon or a local dialect, providing more information would be helpful in attempting to determine its intended meaning.
Trade name of a solution of menthol and formaldehyde in alcohol, used by inhalation in tuberculosis.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.