Poison sumac, Toxicodendron vernix, is related to the poison ivies and poison oaks, not to the other sumacs. It is relatively rare, compared to the other members of the family.
Definition of taproom in US English - a room in which alcoholic drinks, especially beer, are available on tap; a bar in a hotel or inn. Definition of taproom in US English - a room in which alcoholic drinks, especially beer, are available on tap; a bar in a hotel or inn.
Chat room is a virtual room where a chat session takes place. Technically, a chat room is really a channel, but the term room is used to promote the chat metaphor. In a chat room, people communicate using on-screen text, typed in real-time.