macropinacoid

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noun

One of the two planes of an orthorhombic crystal which are parallel to the vertical and longer lateral (macrodiagonal) axes.

OriginEnglish pinacoid ← French macro- ← Ancient Greek μᾰκρός (măkrós) →
Scrabble 22
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Meanings

nounmacropinacoid (plural macropinacoids)

plural macropinacoids

  1. chemistryOne of the two planes of an orthorhombic crystal which are parallel to the vertical and longer lateral (macrodiagonal) axes.

Origin

  1. Proto-Indo-European*meh₂ḱ-
  2. Proto-Indo-European*mh₂ḱrós
  3. Proto-Hellenic*makrós
  4. Ancient Greekμᾰκρός (măkrós)
  5. Frenchmacro-
  6. Englishmacro-
  7. Englishpinacoid
  8. Englishmacropinacoid

From macro- + pinacoid.

Full word history & related roots →
Cite this entry
APA

macropinacoid. (n.d.). In WatkinsX Dictionary. Retrieved November 3, 2026, from https://dictionary.watkinsx.com/word/macropinacoid

MLA

“macropinacoid.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/macropinacoid. Accessed November 3, 2026.

Chicago

WatkinsX Dictionary, s.v. “macropinacoid,” accessed November 3, 2026, https://dictionary.watkinsx.com/word/macropinacoid.

Source: macropinacoid on Wiktionary, CC BY-SA 4.0.