2. Behind a ship; in the rear. "A gale of wind right astern." De Foe.
"Left this strait astern." Drake. To bake astern, to go stern
foremost.
— To be astern of the reckoning, to be behind the position given by
the reckoning.
— To drop astern, to fall or be left behind.
— To go astern, to go backward, as from the action of currents or
winds.

ASTERNAL
A*ster"nal, a. Etym: [Pref. a- not + sternal.] (Anat.)

Defn: Not sternal; — said of ribs which do not join the sternum.

ASTEROID
As"ter*oid, n. Etym: [Gr. astéroïde. See Aster.]

Defn: A starlike body; esp. one of the numerous small planets whose orbits lie between those of Mars and Jupiter; — called also planetoids and minor planets.

ASTEROIDAL
As`ter*oid"al, a.

Defn: Of or pertaining to an asteroid, or to the asteroids.

ASTEROLEPIS
As`te*rol"e*pis, n. Etym: [NL., fr. Gr. (Paleon.)

Defn: A genus of fishes, some of which were eighteen or twenty feet long, found in a fossil state in the Old Red Sandstone. Hugh Miller.

ASTEROPE
As*ter"o*pe, n. [Gr. , lit., lightning.]