pliotron

[ plahy-uh-tron ]
/ ˈplaɪ əˌtrɒn /

noun Electronics.

any hot-cathode vacuum tube having an anode and one or more grids.

Origin of pliotron

First recorded in 1910–15; formerly a trademark
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019