lap·wing (lāp'wĭng') n. Any of several Old World birds of the genus Vanellus related to the plovers, especially V. vanellus, having a narrow crest and erratic flight behavior. Also called green plover, pewit.
[By folk etymology from Middle English lapwink, hoopoe, lapwing, from Old English hlēapewince : hlēapan, to leap + *wincan, to waver.]