undermate
nounEtymology From under- + mate.
1
A junior officer on board a ship.
- Twice I actually hired myself as an under-mate in a Greenland whaler, and acquitted myself to admiration.1816 June – 1817 April/May (date written), [Mary Shelley], Frankenstein; or, The Modern Prometheus. […], volume (please specify |volume=I to III), London: […] [Macdonald and Son] for Lackington, Hughes, Harding, Mavor, & Jones, published 1 January 1818, →OCLC: