sam (i ham, o sam), pl. saim, coll. pl. sammath
Sindarin
sam
noun. chamber, chamber, [G.] room
sam
noun. chamber
sammath
noun. chambers
sam
chamber
sam
chamber
(i ham, o sam), pl. saim, coll. pl. sammath
daur a berhael, conin en annûn
Frodo and Sam, princes of the west
sav-
verb. to have
A verb for “to have” in Definitive Linguistic Notes (DLN) from 1959, derived from the root √SAM of the same meaning (PE17/173). It was the opposite of pen- “to lack, have not”. As such, it seems the verb sav- was not usually negated, but pen- was used instead as in penim vast “we have no bread” [= (lit.) ✱“we lack bread”] (PE17/144).
sevin
8r$5% verb. I have
v. aor. & pron. suff. I have. Q. samin. >> -n
gar
have
gar- (i **âr, i ngerir = i ñerir) (hold, possess; be able, can); pa.t. garant**. (AI:92, VT45:14)
pannen
adjective. arranged, settled, done
The word sammath “chambers” appeared in the name Sammath Naur “Chambers of Fire” for the cavernous chambers in the interior of Mount Doom (LotR/942). It appears to be the class-plural of an otherwise unattested noun ✱sam “chamber”.
Conceptual Development: Earlier forms of this word were G. tham “chamber, room” from the Gnomish Lexicon of the 1910s (GL/72) and N. tham “hall” from The Etymologies of the 1930s under the root ᴹ√STAB (Ety/STAB). The Gnomish word was cognate to ᴱQ. sambe “room, chamber” in the Qenya Lexicon of the 1910s under the early root ᴱ√SAMA (QL/81), though the Gnomish form tham indicates the actual form of the root was (or became) ✱ᴱ√ÞAMA. Likewise the Noldorin word in the 1930s was cognate to ᴹQ. sambe “room, chamber” but with a distinct gloss = “hall” (Ety/STAB). The form sammath from the 1950s may indicate another revision of the root to √SAB or √SAM, though both of these conflict with other roots from the 1950s and 60s: √SAB “believe” (PE22/158) and √SAM “to have” (PE17/183).
Alternately, sammath could in fact be based on [N.] tham, with the initial consonant dissimilating away from the final *-th*, a phenomenon also seen in úthaes “temptation”. Hat-tip to Elaran for pointing this out to me.
Neo-Sindarin: I now prefer this final explanation of sammath as an abnormal class-plural of tham, and so would use tham for both “hall” and “chamber” in the singular, but would make sammath its class plural.