Yes, HEROIC is a Scrabble word!

Letter values in Scrabble US: H 4, E 1, R 1, O 1, I 1, C 3.

Is it a valid word?

HEROIC is a valid word in the official Scrabble dictionary (US), the UK Scrabble Dictionary and Words with Friends (ENABLE).

a verse form suited to the treatment of heroic or elevated themes; dactylic hexameter or iambic pentameter

very imposing or impressive; surpassing the ordinary (especially in size or scale)
relating to or characteristic of heroes of antiquity
having or displaying qualities appropriate for heroes
of behavior that is impressive and ambitious in scale or scope
showing extreme courage; especially of actions courageously undertaken in desperation as a last resort

Also: heroic verse, heroic meter, larger-than-life.