- Learn English
-
Learn grammar
-
List of words
-
Study your cards
-
Hang On, Man!
-
Audio Books
-
More apps
- Recent searches
-
ambition
-
measurably
-
insignificant
-
pigheadedness
-
hollow
-
headquarters
-
include
-
languorous
-
abience
-
absit
- Hide translation
acorn tube
acorn tube /ˈeɪˌkɔrn tuːb/
noun
-
A small vacuum tube; used at high frequencies
(
acorn tube
)
a small vacuum tube; used at high frequencies