The Collaborative International Dictionary of English v.0.48:
Oulachan \Ou"la*chan\, n. (Zool.) Same as Eulachon. [1913 Webster]The Collaborative International Dictionary of English v.0.48:
Eulachon \Eu"la*chon\, n. [Native Indian name.] (Zo["o]l.) The candlefish. [Written also oulachan, oolacan, and ulikon.] See Candlefish. [1913 Webster]