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

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

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

Not astonished.