- Learn English
-
Learn grammar
-
List of words
-
Study your cards
-
Hang On, Man!
-
Audio Books
-
More apps
- Recent searches
-
qualifying
-
adam's needle-and-thread
-
abuzz
-
read
-
pugnacity
-
prestidigitation
-
menace
-
because of
-
sharply
-
4
- 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