pion definition by Wordo

Noun

Any

of

three

semistable

mesons

,

having

positive

,

negative

or

neutral

charge

,

composed

of

up

and

down

quarks

/

antiquarks

. --

either

π<

sup

>

0

sup

>,

a

neutral

form

with

a

mass

264

times

that

of

an

electron

,

or

π<

sup

>+sup

>

or

π<

sup

>&

mdash

;sup

>,

a

charged

form

with

a

mass

273

times

that

of

an

electron

.