Placodermi :: Placodermi (n. pl.) An extinct group of fishes, supposed to be ganoids. The body and head were covered with large bony plates. See Illust. under Pterichthys, and Coccosteus..
Powdermill :: Powdermill (n.) A mill in which gunpowder is made.
Scleroderm :: Scleroderm (n.) One of a tribe of plectognath fishes (Sclerodermi) having the skin covered with hard scales, or plates, as the cowfish and the trunkfish..
Spermoderm :: Spermoderm (n.) The covering of a seed; -- sometimes limited to the outer coat or testa.
Stenoderm :: Stenciler (n.) One who paints or colors in figures by means of stencil.
Stenodermine :: Stenoderm (n.) Any species of bat belonging to the genus Stenoderma, native of the West Indies and South America. These bats have a short or rudimentary tail and a peculiarly shaped nose membrane..