Webster's Revised Unabridged Dictionary · 1913

Notodontian

Notodontian , noun

[Greek nw^ton the back + 'odoy`s, 'odo`ntos a tooth.]

(Zoology) Any one of several species of bombycid moths belonging to Notodonta, Nerice, and allied genera. The caterpillar of these moths has a hump, or spine, on its back.