I. ˈ ̷ ̷ ̷ ̷ˌ ̷ ̷ noun
Etymology: probably from doodle (I) + bug
1. : the larva of an ant lion ; broadly : any of several other insects
2. : one who does not stand up for his convictions
3.
a.
(1) : an unscientific device (as a divining rod) for locating underground gas, water, oil, or ores
(2) also doo·dle·bug·ger “+ə(r) : one professing skill with such a contrivance
(3) : a seismograph, gravimeter, or other scientific device for the location of minerals
b. : a small tractor used in lumbering or farming
c.
(1) : a rail motorcar used by railroad employees in construction and maintenance-of-way work
(2) : a small local train
d.
(1) : a small military tank
(2) : an army utility truck
e. : robot bomb
f. : a magnetic detecting device ; specifically : an airborne magnetometer used for spotting submarines
g. : a midget racing automobile
h. : a very small airplane
II. intransitive verb
: to use a doodlebug in a search