- Learn English
-
Learn grammar
-
List of words
-
Study your cards
-
Hang On, Man!
-
Audio Books
-
More apps
- Recent searches
-
numbers game
-
half snipe
-
veiled
-
diabolic
-
consecutive
-
strategian
-
slum
-
perfect
-
rypticus
-
prep
- 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