Webster's Revised Unabridged Dictionary · 1913

Res

Res (r?z) , noun

[Latin]

A thing; the particular thing; a matter; a point.
Collocations (2)
Res gestae (Law) , the facts which form the environment of a litigated issue. — Wharton
Res judicata (Law) , a thing adjudicated; a matter no longer open to controversy.