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[French acrostiche, from Old French, from Greek akrostikhis, akron, head, end; see acromegaly, + stikhos, line.]

noun

A poem or series of lines in which certain letters, usually the first in each line, form a name, motto, or message when read in sequence.

See word square

derivatives

a·cros’tic

adjective

a·cros’ti·cal·ly

adverb

word square

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noun

Games

A set of words arranged in a square such that they read the same horizontally and vertically. Also called acrostic

RASCAL:

R: Really

A: About

S: Silly

C: Children

A: At

L: Large

I assumed you wanted the same format, otherwise you would have looked the word up in a dictionary, you rascal you!