diradical

di·rad·i·cal

[dahy-rad-i-kuhl]
noun Chemistry.
an atom or molecule having two unpaired electrons.
Also called biradical.
Compare free radical.


Origin:
di-1 + radical

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Diradical is always a great word to know.
So is gobo. Does it mean:
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.
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