amidships

Short definition from Wiktionary

Adverb

1. 1
   In the middle of a ship, either longitudinally or laterally.
2. 2
   Usually in the line of the keel, but sometimes halfway between bow and stern; often contracted to “midships.” (FM 55-501).
3. 3
   On the flank, at a vulnerable place.

Interjection

1. 1
   A helm order, normally shortened to midships!, to centre the helm in the line of the keel.