A somewhat formal or literary term for a person who drinks alcohol, often implying habitual or heavy drinking. Compare with the more common 酒飲み (さけのみ).
See also: 酒飲み (さけのみ)
He is a heavy drinker and never misses a drink every night.
Compound of 飲酒 (いんしゅ, 'drinking alcohol') and 家 (か, 'person' or 'specialist').