1.
[syn: alderfly, alder fly, Sialis lutaria]
The Collaborative International Dictionary of English v.0.48:
alderfly \al"der*fly`\, Alder fly \Al"der fly\
1. Any of numerous dark-colored neuropterous insects of the
genus Sialis or allied genera. They have predaceous
aquatic larv[ae], which are used for bait.
[Webster 1913 Suppl.]
2. (Angling) An artificial fly with brown mottled wings, body
of peacock harl, and black legs.
[Webster 1913 Suppl.]
WordNet (r) 3.0 (2006):
alderfly
n 1: dark-colored insect having predaceous aquatic larvae [syn:
alderfly, alder fly, Sialis lutaria]