Term: nacreous cloud: a luminous iridescent cloud at a high altitude that may be seen when the sun is a few degrees below the horizon
Broader: natural phenomenon: all phenomena that are not artificial | Unrelated: resilience: the physical property of a material that can return to its original shape or position after deformation that does not exceed its elastic limit
Broader: natural phenomenon: all phenomena that are not artificial | Unrelated: lead poisoning: toxic condition produced by the absorption of excessive lead into the system
Broader: natural phenomenon: all phenomena that are not artificial | Unrelated: polygraph: a medical instrument that records several physiological processes simultaneously (e.g., pulse rate and blood pressure and respiration and perspiration)
Broader: natural phenomenon: all phenomena that are not artificial | Unrelated: mozart: the music of Mozart
Broader: natural phenomenon: all phenomena that are not artificial | Unrelated: drop-leaf table: a table that has a drop-leaf to enlarge its surface
Broader: natural phenomenon: all phenomena that are not artificial | Unrelated: guanine: a purine base found in DNA and RNA; pairs with cytosine
Broader: natural phenomenon: all phenomena that are not artificial | Unrelated: elodea: submerged freshwater perennials
Broader: natural phenomenon: all phenomena that are not artificial | Unrelated: mid-march: the middle part of March
Broader: natural phenomenon: all phenomena that are not artificial | Unrelated: peck: a United States dry measure equal to 8 quarts or 537.605 cubic inches
Broader: natural phenomenon: all phenomena that are not artificial | Unrelated: signpost: a post bearing a sign that gives directions or shows the way