Entry 2 senses · 2 variants Webster, 1913 Glassful · Glass·ful · IPA /ˈɡlæsfəl/ n. a. 01 n. The contents of a glass; as much of anything as a glass will hold. pl. Glassfuls 1. The contents of a glass; as much of anything as a glass will hold. 02 a. Glassy; shining like glass. 1. Glassy; shining like glass.[Obs.]