(chemistry) Any of a number of molecules that mutually exhibit metamerism / (psychology) One of multiple physically distinct stimuli (particularly those of colour) that exhibit metamerism.

plural of metamer

Alternative spelling of metham sodium

Characterised by or exhibiting a change in form or character.

(mineralogy) A rock that has been changed from its original form by subjection to heat and/or pressure.

A transformation, such as one performed by magic. / A noticeable change in character, appearance, function or condition.

(of a moth or insect, intransitive) To undergo metamorphosis. / (by extension, intransitive) To undergo some transformation.

(geology) The process by which rocks are changed into other forms by the application of heat and/or pressure.

(geology) one of the major groups of rock that makes up the crust of the Earth; consists of pre-existing rock mass in which new minerals or textures are formed at higher temperatures and greater pressures than those present on the Earth's surface

(engineering, physics) any material that obtains its electromagnetic properties from its structure rather than from its chemical composition; especially a material engineered to have features of a size less than that of the wavelength of a class of electromagnetic radiation