An Etymological Dictionary of Astronomy and Astrophysics

1a) A state of mind in which one is troubled; worry, anxiety, or concern;
a cause or object of worry, anxiety, concern, etc.

1b) Serious attention; solicitude; heed; caution.

2a) To be concerned or solicitous; have thought or regard.

2b) To be concerned or have a special preference (Dictionary.com).

Etymology (EN): M.E., from O.E. caru, cearu “sorrow, anxiety, grief,” cognate with Gothic kara, O.H.G. chara lament; M.En. caren, O.E. cearian, carian “be anxious, grieve.”

Etymology (PE): Timâr “care, attendance on the sick; custody; sorrow;” Mid.Pers. têmâr “care; grief”