a. humorous. Of or pertaining to a cellar.

1

1860.  Dickens, Uncomm. Trav., ix. (1861), 133. A little side door … stood open, and disclosed certain cellarous steps. Ibid. (1867), All Y. Round, Christm. No., No Thoroughf., 15. Vendale … went down for a cellarous stroll.

2