A verb appearing as its Noldorin-style infinitive form rhitho “jerk, twitch, snatch” in The Etymologies of the 1930s, derived from the root ᴹ√RIK(H) “jerk, sudden move, flirt” (Ety/RIK(H)).
Neo-Sindarin: Since initial r unvoiced to rh in Noldorin of the 1930s but not in Sindarin of the 1950s and 60s, many Neo-Sindarin writers adapt this word as ᴺS. ritha-, as suggested in HSD (HSD).
Conceptual Development: Earlier verbs for “to jerk” included G. ciltha- from Gnomish Lexicon of the 1910s (GL/26), clearly a cognate of ᴱQ. kilti- “to jerk, tuck” under the early root ᴱ√KḶTḶ “tilt; fling” (QL/47). Another early verb of similar form but different meaning is G. rictha- “contort, twist, confuse, disarrange, upset” clearly based on the early root ᴱ√RIKI (GL/65; QL/80); see G. rig- “to twist, contort” for further discussion.
A noun in The Etymologies of the 1930s glossed “twitch, jerk, trick, sudden move”, apparently derived from ᴹ✶rinki under the root ᴹ√RIK(H) “jerk, sudden move, flirt” (Ety/RIK(H)).
Neo-Sindarin: Since initial r unvoiced to rh in Noldorin of the 1930s but not in Sindarin of the 1950s and 60s, most Neo-Sindarin writers adapt this word as ᴺS. rinc “twitch, jerk, sudden move”, as suggested in HSD (HSD).
Conceptual Development: Earlier nouns for “jerk” included G. cilt from Gnomish Lexicon of the 1910s (GL/26), clearly a cognate of ᴱQ. kilt “tuck” under the early root ᴱ√KḶTḶ “tilt; fling” (QL/47).