orthohydrogen
English
Etymology
From
ortho-
+
hydrogen
.
Noun
orthohydrogen
(
countable and uncountable
,
plural
orthohydrogens
)
(
physics
)
form
of the
hydrogen
molecule
(H
2
) in which the two
nuclei
have
parallel
spin
; about 75% of natural hydrogen
Antonyms
parahydrogen