plethrum
Pleth"ron, Pleth"rum, n.; pl. Plethra. Etym: [NL., fr. Gr. (Gr. Antiq.) Defn: A long measure of 100 Greek, or 101 English, feet; also, a square measure of 10,000 Greek feet.
Pleth"ron, Pleth"rum, n.; pl. Plethra. Etym: [NL., fr. Gr. (Gr. Antiq.) Defn: A long measure of 100 Greek, or 101 English, feet; also, a square measure of 10,000 Greek feet.