Parahydrogen

noun

noun ·Rare ·Advanced level

Definitions

Noun
  1. 1
    The form of the hydrogen molecule (H₂) in which the two nuclei have antiparallel spin; about 25% of hydrogen at room temperature. countable, uncountable

Etymology

From para- + hydrogen.

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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.