I. ˈhal-sē-ən noun
Etymology: Middle English alceon, from Latin halcyon, from Greek alkyōn, halkyōn
Date: 14th century
1. : a bird identified with the kingfisher and held in ancient legend to nest at sea about the time of the winter solstice and to calm the waves during incubation
2. : kingfisher
II. adjective
Date: 1601
1. : of or relating to the halcyon or its nesting period
2.
a. : calm , peaceful
b. : happy , golden
c. : prosperous , affluent