RUGOSITY
Ru*gos"i*ty, n. Etym: [l. rugositas: cf. F. rugosité.]
Defn: The quality or state of being rugose.
RUGOUS
Ru"gous, a. Etym: [Cf. F. rugueux.]
Defn: Wrinkled; rugose.
RUGULOSE
Ru`gu*lose", a.
Defn: Somewhat rugose.
RUHMKORFF'S COIL Ruhm"korff's coil`. Etym: [So called from its inventor, Ruhmkorff, a german physicist.] (Elec.)
Defn: See Induction coil, under Induction.
RUIN Ru"in, n. Etym: [OE. ruine, F. ruine, fr. L. ruina, fr. ruere, rutum, to fall with violence, to rush or tumble down.]
1. The act of falling or tumbling down; fall. [Obs.] "His ruin startled the other steeds." Chapman.