Perspex

/ˈpɜːspɛks/
noun
1.
trademark any of various clear acrylic resins, used chiefly as a substitute for glass

1935, trade name in Britain for what in the U.S. is called Plexiglas or Lucite, irregularly formed from Latin perspect-, past participle stem of perspicere “look through, look closely at” (see perspective).

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Perspicacious
[pur-spi-key-shuh s] /ˌpɜr spɪˈkeɪ ʃəs/ adjective 1. having keen mental perception and understanding; discerning: to exhibit perspicacious judgment. 2. Archaic. having keen vision. /ˌpɜːspɪˈkeɪʃəs/ adjective 1. acutely perceptive or discerning 2. (archaic) having keen eyesight adj. 1630s, formed as an adjective to perspicacity, from Latin perspicax “sharp-sighted, having the power of seeing through; acute” (see […]
Perspicaciousness
[pur-spi-key-shuh s] /ˌpɜr spɪˈkeɪ ʃəs/ adjective 1. having keen mental perception and understanding; discerning: to exhibit perspicacious judgment. 2. Archaic. having keen vision. /ˌpɜːspɪˈkeɪʃəs/ adjective 1. acutely perceptive or discerning 2. (archaic) having keen eyesight adj. 1630s, formed as an adjective to perspicacity, from Latin perspicax “sharp-sighted, having the power of seeing through; acute” (see […]
Perspicacity
[pur-spi-kas-i-tee] /ˌpɜr spɪˈkæs ɪ ti/ noun 1. keenness of mental perception and understanding; discernment; penetration. 2. Archaic. keen vision. n. 1540s, from Middle French perspicacité (15c.) and directly from Late Latin perspicacitas “sharp-sightedness, discernment,” from Latin perspicax “sharp-sighted, having the power of seeing through,” from perspicere “look through, look closely at” (see perspective).

Perspicuous
[per-spik-yoo-uh s] /pərˈspɪk yu əs/ adjective 1. clearly expressed or presented; lucid. 2. . /pəˈspɪkjʊəs/ adjective 1. (of speech or writing) easily understood; lucid adj. late 15c., from Latin perspicuus “transparent, clear, evident,” from perspicere “look through, look closely at” (see perspective). Related: Perspicuously; perspicuousness.
Perspicuity
[pur-spi-kyoo-i-tee] /ˌpɜr spɪˈkyu ɪ ti/ noun 1. clearness or lucidity, as of a statement. 2. the quality of being . /ˌpɜːspɪˈkjuːɪtɪ/ noun 1. the quality of being perspicuous 2. acute perception; perspicacity n. late 15c., of things; 1540s, of expressions, from Latin perspicuitas “transparency, clearness,” from perspicuus, from perspicere “look through, look closely at” (see […]