thorn

thorn /ˈθoɚn/ noun
plural thorns
thorn
/ˈθoɚn/
noun
plural thorns
Britannica Dictionary definition of THORN
[count]
1 
: a sharp point on the stem of some plants (such as roses) — see color picture on this page
2 
British : a tree or bush that has thorns

a thorn in the/your flesh/side

: a person or thing that repeatedly annoys you or causes problems for you

— thorned

/ˈθoɚnd/ adjective

— thornless

/ˈθoɚnləs/ adjective