INVOLUTE

I. adjective Etymology: Latin involutus concealed, from past participle of involvere Date: 1661 1. curled spirally, b. curled or curved inward, having the edges rolled over the upper surface toward the midrib , having the form of an ~ , involved , intricate , II. noun Date: circa 1796 a curve traced by a point on a thread kept taut as it is unwound from another curve , III. intransitive verb (-luted; -luting) Date: 1816 to become ~, 2. to return to a former condition, to become cleared up ; disappear