1610s, "a discourse or treatise on an art or the arts," from Latinized form of Greek tekhnologia "systematic treatment of an art, craft, or technique," originally referring to grammar, from tekhno-, combining form of tekhnē "art, skill, craft in work; method, system, an art, a system or method of making or doing," from PIE *teks-na- "craft" (of weaving or fabricating), from suffixed form of root *teks- "to weave," also "to fabricate." For ending, see -logy.
The meaning "study of mechanical and industrial arts" (Century Dictionary, 1895, gives as examples "spinning, metal-working, or brewing") is recorded by 1859. High technology is attested by 1964; short form high-tech by 1972.
1610s, "one who points out or proves," agent noun in Latin form from demonstrate. From 1680s as "one who uses specimens or experiments as a method of teaching;" 1870 as "one who participates in public demonstrations."
method of painting, 1868, from French gouache "watercolors, water-color painting" (18c.), from Italian guazzo "watercolor," originally "spray, splash, puddle, pool," from Latin aquatio "watering, watering place," from aquatus, past participle of aquari "to bring water for drinking," from aqua "water" (from PIE root *akwa- "water").
also often bandana, 1752, from Hindi bandhnu, a method of dyeing, from Sanskrit badhnati "binds" (because the cloth is tied in different places like modern tie-dye), from PIE root *bhendh- "to bind." Perhaps to English via Portuguese. The colors and spots are what makes it a bandanna.
1838, literally "of the same measure," from iso- "the same, equal" + -metric. The components are Greek: isos "equal, identical" + metron "a measure." Originally a method of using perspective in drawing; later in reference to crystals. The physiological sense relating to muscular action is from 1889, from German isometrisch in this sense (1882).