rheidn.adj.

1954 S. W. Carey in Jrnl. Geol. Soc. Austral. 1 70 The substance deforms as a fluid. In order to distinguish it from a liquid (seeing that it is below its melting point)..such a substance is here named a rheid.

1963 F. J. Turner & L. E. Weiss Struct. Anal. Metamorphic Tectonites viii. 321 We still have no knowledge of the threshold conditions beyond which rocks such as granite and schist..can be regarded as rheids.

2005 Times Union (Albany, N.Y.) (Nexis) 15 Dec. d1 If you formed the Putty into a perfectly round meatball at night, it turned into a pancake by morning. ‘That's because it's a rheid,’ explained my husband. ‘It looks like a solid, but it's actually a viscoelastic liquid.’

2008 A. J. Waskey in S. G. Philander Encycl. Global Warming & Climate Change I. 282/2 Fluids—liquids, gases, and rheids—undergo movements as convection currents.

1954 Jrnl. Geol. Soc. Australia 1 83 Empirical observations of solid intrusion of serpentine by rheid flow.

1965 A. Holmes Princ. Physical Geol. (rev. ed.) ix. 204 While ice or any other solid body in a rheid state is slowly flowing, the deformation stress may temporarily increase to a point where the material is compelled to fracture.

1972 J. G. Dennis Struct. Geol. v. 102 A material is rheid by virtue of the time of observation. Rocks are not rheid in a quarry operation, but they are so during geological deformation.

2000 Ann. Assoc. Amer. Geographers 90 778/1 The overstated view, in my opinion, that gravity-driven creep processes are really mainly rheid flow.