S.V.

abbr.
1 a side valve.
2 (in a reference) under the word or heading given.
Etymology: sense 2 f. L sub voce (or verbo)

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Holy Virgin.

[ < L Sancta Virgo]

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s.v.,

sub verbo or sub voce (under the word or heading).

S.V.,

Sons of Veterans.

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abbr. used in textual references before a word or heading to indicate that a specified item can be found under it

the dictionary defines "sweet dreams" (s.v. "sweet")

Origin:

from Latin sub voce or sub verbo, literally ‘under the word or voice’