Tur·tle·head n. Bot. An American perennial herb (Chelone glabra) having white flowers shaped like the head of a turtle. Called also snakehead, shell flower, and balmony.
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Chelone glabra
n : showy perennial of marshlands of eastern and central North
America having waxy lanceolate leaves and flower with
lower part creamy white and upper parts pale pink to deep
purple [syn: shellflower, shell-flower, turtlehead,
snakehead, snake-head]