θɔ:n n. 1 a
stiff sharp-pointed
projection on a
plant. 2 a thorn-bearing shrub or
tree. 3
the name of an
Old English and Icelandic runic
letter, =
th. øon thorns continuously
uneasy esp. in
fear of
being detected. thorn-apple 1 a poisonous plant of the
nightshade family,
Datura stramonium. 2 the
prickly fruit of
this. a thorn in one's
flesh (or side) a
constant annoyance. øøthornless adj. thornproof adj. [OE f. Gmc]