The Collaborative International Dictionary
Triptote
Triptote \Trip"tote\, n. [L. triptotum, Gr. ? with three cases; ? (see Tri-) + ? falling, fr. ? to fall.] (Gram.) A noun having three cases only.
Wiktionary
triptote
n. (cx grammar English) In grammar, a noun which has three case.
In Modern Standard Arabic, nouns belong to triptotes or diptotes, or can be indeclinable.