Term: echo: the repetition of a sound resulting from reflection of the sound waves
Broader: reflection: the ability to reflect beams or rays | Unrelated: rheumatoid arthritis: a chronic autoimmune disease with inflammation of the joints and marked deformities; something (possibly a virus) triggers an attack on the synovium by the immune system, which releases cytokines that stimulate an inflammatory reaction that can lead to the destruction of all components of the joint
Broader: reflection: the ability to reflect beams or rays | Unrelated: inflation: (cosmology) a brief exponential expansion of the universe (faster than the speed of light) postulated to have occurred shortly after the big bang
Broader: reflection: the ability to reflect beams or rays | Unrelated: sial: the granitelike rocks that form the outermost layer of the earth's crust; rich in silicon and aluminum
Broader: reflection: the ability to reflect beams or rays | Unrelated: plexus: a network of intersecting blood vessels or intersecting nerves or intersecting lymph vessels
Broader: reflection: the ability to reflect beams or rays | Unrelated: picometer: a metric unit of length equal to one trillionth of a meter
Broader: reflection: the ability to reflect beams or rays | Unrelated: alveolitis: inflammation in the socket of a tooth; sometimes occurs after a tooth is extracted and a blood clot fails to form
Broader: reflection: the ability to reflect beams or rays | Unrelated: animalism: preoccupation with satisfaction of physical drives and appetites
Broader: reflection: the ability to reflect beams or rays | Unrelated: ostinato: a musical phrase repeated over and over during a composition
Broader: reflection: the ability to reflect beams or rays | Unrelated: ace of spades: the ace in the spade suit; sometimes taken as a portent of death
Broader: reflection: the ability to reflect beams or rays | Unrelated: common law: a system of jurisprudence based on judicial precedents rather than statutory laws