n. [ L. aptotum, Gr. &unr_; indeclinable; 'a priv. + &unr_; fallen, declined, &unr_; to fall. ] (Gram.) A noun which has no distinction of cases; an indeclinable noun. [ 1913 Webster ]

n. [ L. (pl.) pentaptota. Gr. &unr_; with five cases; &unr_; (see Penta-) + &unr_; falling. ] (Gram.) A noun having five cases. [ 1913 Webster ]

n. [ L. tetraptotum, Gr. &unr_;. ] (Gram.) A noun that has four cases only. Andrews. [ 1913 Webster ]