Definition of "showerful"

The last tall son of Lot and Bellicent, And tallest, Gareth, in a showerful spring Stared at the spate.

1872, Alfred Tennyson, Gareth and Lynette

Why so woe-begone ? and why, Philaenis, these reckless tearings of hair, and suffusion of showerful eyes ?

1938, John William Mackail, Select epigrams from the Greek anthology, page 24

It was warm there too in the last icy spasms of winter. The spring was showerful.

1967, New South African Writing - Issue 4, page 50

Enlil hates me and I can no longer dwell among you, can no longer set my footsteps on the soil that is Enlils; but if I go down into the Apsu, dwelling with my lord Ea, then will Enlil send you showerfuls, raining down abundance on you.

1970, D. W.Thomas, Documents from Old Testament times, page 21

After the first showerful of earth was flung in over the victims, the infant Patsy stirred his feeble hand slightly.

1980, Sean Henry, Tales from the West of Ireland, page 35

white snow falls from the sky o o w o o in small drops in big drops in whole showersful

1991, Grace Nichols, Can I buy a slice of sky?:

Our show tonight is powerful, We'll wow you with an hourful Of showers from a showerful of stars

2000, Merrill Joan Gerber, The Kingdom of Brooklyn, page 81

While Jim McAllister may continue lying to himself about his usefulness through another couple of broken marriages and career failures, you come out of Election suspecting that Tracy's delusions will, at some point not too far away, hit her with an awful powerful showerful of truth, and she will stagger under its weight.

2011, Garry Mulholland, Stranded at the Drive-In: The 100 Best Teen Movies