A word in the Gnomish Lexicon of the 1910s glossed “plane tree” [perhaps Genus Platanus], apparently an elaboration of the plural mabin of G. mô/mab “hand” (GL/55). Tolkien said it was “usually + aj. fathwed [tasselled]”, presumably ✱mabinos fathwed “tasseled plane tree”. He also said that m. gwilbriniol, presumably G. ✱mabinos gwilbriniol, was another word for “sycamore” and was equivalent to G. mavlantos.
Gnomish
mab
noun. hand(s)
mablon
masculine name. Mablon
mabwed
adjective. handed, having hands, dextrous
mabinos
noun. plane tree
mabwedri
noun. dexterity
mablad
noun. palm of the hand
mabrin(d)
noun. wrist
mablui
feminine name. Hand of Snow
mab(a)
noun. mother
mablios
adjective. cunning
mablung
masculine name. Heavy-hand(ed)
mabol
adjective. skillful
mabin glossi
white hands
mabinos gwilbriniol
noun. sycamore
mabir
noun. mother
mablod
noun. palm of the hand
mab ’loss
a white hand
mavlantos
noun. sycamore
A word appearing as G. mavlantos “sycamore” in the Gnomish Lexicon of the 1910s, apparently a blending of G. mavlant “palm” and G. blantos “sycamore” (GL/23, 55). This word likely refers to the sycamore’s flat and palm-like leaves.
Neo-Sindarin: For purposes of Neo-Sindarin I would adapt this word as ᴺS. mablanthos, a noun formation based on mâb and [ᴺS.] plant “flat”.
amaith
noun. mother
amil
noun. mother
blantos
noun. sycamore
mô
noun. hand
nanwin
noun. mother
naptha-
verb. to seize
nân
noun. mother
A word appearing as G. mabwed “handed, having hands. dexterous” in the Gnomish Lexicon of the 1910s, an adjectival form of G. mab “hand(s)” (GL/55). It also appeared with a vocalic augment: G. amabwed “having hands” (GL/19). This augmented form amabwed reappeared in the Gnomish Lexicon Slips modifying that document (PE13/109).
Neo-Sindarin: For purposes of Neo-Sindarin, I would adapted this word as ᴺS. mabren using a later adjectival suffix: -ren.