Popularity: Bottom 20% of words
A person who deals in second-hand books. Today, we’d call him a Used Book Salesman.
Like all the rest of the world, he possessed the termination in ist, without which no one could exist at that time, but he was neither a Royalist, a Bonapartist, a Chartist, an Orleanist, nor an Anarchist; he was a bouquinist, a collector of old books. –Les Miserables, Volume III, Marius
Middle French boucquain (“rare old book”), from Middle Dutch *boeckin, *boeckijn (“little book”), diminutive of Middle Dutch boec (“book”), (compare Middle Dutch boecskin, boekelkin). More at book, -kin.