(pharmacology) A direct-acting smooth muscle relaxant used to treat hypertension by acting as a vasodilator primarily in arteries and arterioles.

(aviation) The speed of an aircraft relative to the air through which it is flying.

(poetry, Scotland, Northern England) Twilight, as at early morning (dawn) or (especially) early evening; dusk. / (obsolete) Sullenness; melancholy.

Not astonished.