. . .a thin triangular flap of a heart valve. . . a small book usually having a paper cover . . . a medical lit-art e-journal from The Permanente Press
Looking at the Rio Grande gorge near Taos, I was impressed by its width and depth. I was told by a guide that the bridge over it has to be augmented and lengthened as the gorge is widening. This is a metaphor for some relationships I know.