[An etymologizing alteration of prec. There is no evidence of the independent use of rarebit.] = prec.

1

1785.  Grose, Dict. Vulgar T., Rabbit, a Welch rabbit, bread and cheese toasted, i. e. a Welch rare bit.

2

1845.  Alb. Smith, Fort. Scatterg. Fam., xliii. One of those inextricable visions which are alone dependent upon love, or Welsh rarebits, for their origin.

3

1865.  Morn. Star, 10 April. Then you advance to steaks,… thence to marrow-bones, thence to Welsh rarebit.

4

1905.  H. G. Wells, Kipps, I. vi. § 6. He had also eaten two Welsh rarebits—an unusual supper.

5