acantho-, acanth-, -acanth, -acanths, -acanthid, -acanthous

(Greek: used either as a prefix or as a suffix; pointed appendages; spine, spiny; thorn, thorny)

priacanthine
purposeless hyperactivity
Random excess activity that fulfills no purpose.

In organic brain disease, stimulation sufficient to produce any response typically provokes purposeless hyperactivity in addition to the appropriate response.

pyracanth
1. Thorny-fire plants.
2. A thorny evergreen shrub found in southern Europe that bear clusters of white flowers and scarlet berries.
pyracantha
Fire thorn or a thorny evergreen bush cultivated for its bright orange or red fruits. Native to Europe, Asia.
tetracanth
tetrachanthous
Having four spines, as a fish, etc., or thorns in groups of four.
tragacanth
A gum extract obtained in a dried form from various Asiatic or East European species of plants; any shrub or tree yielding this gum which is used in the arts and as an emulsifying agent and pill excipient in pharmacy.
triacanthoid
typacanthid
xenacanth
xenoacanthine
xenoacanthousm
zoacanthosis
Dermatitis due to foreign bodies such as bristles, hairs, or stingers from animals.