Entry 1 sense Webster, 1913 Eulachon · Eu·la·chon · IPA /ˈjuːləkɒn/ 01 n. The candlefish. [Written also oulachan, oolacan, and ulikon.] See Candlefish. 1. The candlefish. [Written also oulachan, oolacan, and ulikon.] See Candlefish.(Zoöl.) See: Candlefish