splat

Concise Oxford English Dictionary © 2008 Oxford University Press:
splat1

▶noun a piece of thin wood in the centre of a chair back.

– origin C19: from obs. splat ‘split up’; rel. to split.

Concise Oxford English Dictionary © 2008 Oxford University Press:
splat2 informal

▶noun a sound of something soft and wet or heavy striking a surface. ▶adverb with a splat. ▶verb (splats, splatting, splatted) hit or land with a splat.

– origin C19: abbrev. of splatter.