atlanna-

verb. to slope, slant

A verb in The Etymologies of the 1930s appearing in its (Noldorin) infinitive form N. {tlanno >>} atlanno “to slope, slant” under the root ᴹ√TALÁT of similar meaning (Ety/TALÁT; EtyAC/TALÁT). It is not clear why the post vocalic t did not become d as is usual in Noldorin and Sindarin; compare N. adlegi from the same document (EtyAC/LEK). Perhaps atlanno was a remnant of unprefixed tlanno.

Neo-Sindarin: For purposes of Neo-Sindarin, I would use ᴺS. adlanna- “to slope, slant”, as suggested in HSD (HSD).