What is the definition of A ?

A “hummer,” you say, with a joyful sound? Like my Uncle Barry, spinning around! He hums opera while he polishes beets, And chases squirrels with mismatched cleats.

And chases squirrels with mismatched cleats.

A liquid, a fluid, quite bright and bold, Like my uncle’s dentures – stories untold! He slurped down the liquor, a terrible spree, Then claimed he could whistle with his knee!

Then claimed he could whistle with his knee!

A manhater sighed, quite glum and slow, “These humans trip on things they don't know! They build tall towers, then complain about rain, And argue loudly – utter fools, I maintain!”

And argue loudly – utter fools, I maintain!”

A muff, you see, is meant to shield your hand, But I wore one while attempting to stand On my head – a truly baffling plight! It slipped and fell, a fluffy, woolen sight! Now covered in fluff, a rather silly hue, I’m questioning if this really works for you.

I’m questioning if this really works for you.

A
niggle
, a tiny, bothersome plea, Like my socks mismatched – utterly silly me! I fret about fluff on my teapot’s spout, And if squirrels judge my gardening route. It's a ridiculous, minuscule fright, Mostly just focusing on wrongness and light!

Mostly just focusing on wrongness and light!

A period marks the end, you see, Like waiting for your pizza, glee! It's just a little dot, don’t fret, A measured pause – a tasty threat… To silence! (And maybe cheese.)

To silence! (And maybe cheese.)

A stringer once tried to knit a shoe, With yarn and glue – quite sticky and blue! He threaded socks with fervent glee, “A footwear fashion!” cried the silly stringer he.

“A footwear fashion!” cried the silly stringer he.

A weenie once tried to climb a tree, Said, “It's awfully tough for little me!” He wobbled, slipped, and landed with a plea, “Perhaps I’m just… a weenie, you see?”

“Perhaps I’m just… a weenie, you see?”

A whirring sound, a frantic plea, My toaster tried to
whiz
with glee! It launched rye bread across the room, Now breakfast’s chaos, quite consumed!

Now breakfast’s chaos, quite consumed!

A form of lava flow associated with Hawaiian-type volcanoes, consisting of basaltic rock, usually dark-colored with a jagged and loose, clinkery surface. Compare pahoehoe.

Alright class, settle down, let’s take a peek, At this word ‘aa,’ what does it mean, speak! The dictionary tells us, clear as can be, It's lava flow, for all to see. Specifically from volcanoes bright, Hawaiian-type, a wondrous sight! It’s basaltic rock, dark and bold, A story of the earth, ages old. With jagged edges, rough and free, And loose, clinkery – you'll agree! Think of it like this, if you please, ‘Aa’ is different from ‘pahoehoe,’ with ease! It's a contrasting flow, a textured treat, So remember 'aa,' can’t be beat! Any questions popping in your head? Don't delay, Let’s discuss this lava flow today!