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Webster 1913 Edition

Noun.

[Gr.

φάλαινα

φάλλαινα

, a kind of moth.]

(Zool.)

Any moth of the family

Phalænidæ

, of which the cankerworms are examples; a geometrid.

phalaenid ‎(plural phalaenids)

(zoology) Any moth of the family Phalaenidae; a geometrid.
Cankerworms are phalaenids.