Lewis & Short

glūtus or gluttus, a, um, adj. [lit., part. of ‡ gluo, drawn together; hence opp. to crumbling, friable], tenacious, well-tempered, soft: locus bipalio subactus siet beneque terra tenera siet beneque glutus siet, Cato, R. R. 45, 1; also ap. Plin. 17, 18, 29, § 125.
Here too belongs glittis subactis, levibus, teneris, Paul. ex Fest. p. 98 Müll. N. cr.