Yes, AMYGDALA is a Scrabble word!

Letter values in Scrabble US: A 1, M 3, Y 4, G 2, D 2, A 1, L 1, A 1.

Is it a valid word?

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

an almond-shaped neural structure in the anterior part of the temporal lobe of the cerebrum; intimately connected with the hypothalamus and the hippocampus and the cingulate gyrus; as part of the limbic system it plays an important role in motivation and emotional behavior

Also: amygdaloid nucleus, corpus amygdaloideum.