In this post, I want to expand on a footnote in A&G, which lists a whole herd of neuter i-stems, but then offers them no definitions.
Sample i-Stem neuters:
(if given in the plural, singular is rare or non-existent)
in -al
- animal, animālis, animal
- Bacchānal, Bacchānālis, Bacchanalian orgy
- bidental, bidentālis, sacred space struck by lightening
- capital, capitālis, capital punishment
- cervīcal, cervīcālis, pillow, cushion
- cubital, cubitālis, elbow cushion
- frontālia, frontālium, frontlet of a horse (What the hell is that?)
- genuālia, genuālium, leggings
- Lupercal, Lupercālis, cave on the Palatine Hill
- minūtal, minūtalis, stew
- puteal, puteālis, structure surrounding the mouth of a well
- spōnsālia, spōnsālium, wedding
- quadrantal, quandrantālis, unit of liquid measure (a cubic (Roman) foot)
- toral, torālis, valance of a couch (What the hell is that?)
- vectīgal, vectīgālis, tax
in -ar
- altāria, altārium, fittings for burnt offerings (also, apparently now a Pokemon… *nostalgia*)
- cochlear, cochleāris, spoon
- exemplar, exemplāris, example, standard
- lacūnar, lacūnāris, paneled ceiling (example)
- laquear, laqueāris, (also) paneled ceiling
- lūcar, lūcāris, actor’s fee
- lūminār, lūmināris, window shutter
- lupānar, lupānāris, brothel
- palear, paleāris, dewlap (What the hell is that?)
- plantāria, plantārium, sandals
- pulvīnar, pulvināris, couch for image of deity
- Sāturnālia, Sāturnālium, optimo diērum, Catullus 14.15
- speculāria, speculārium, window panes
- tālāria, tālārium, winged sandals of Hermes
- torcular, torculāris, wine press
The Essential AG: 68n1
Latin for Addicts 
