† oxyacanthousadj.
Origin: A borrowing from Latin, combined with an English element. Etymons: Latin oxyacanthus  , -ous suffix.
Etymology:  <  scientific Latin oxyacanthus, specific epithet (see note;  <  post-classical Latin oxyacantha   (later also oxyacanthus  ) a shrub (see note) (6th cent.)  <  Hellenistic Greek ὀξυάκανθα   (also ὀξυάκανθος  ) a shrub with sharp thorns (see note)  <  ancient Greek ὀξυ-  oxy- comb. form1   + ἄκανθα   thorn: see acanthus n.) + -ous suffix.The hawthorn  Crataegus laevigata (formerly  C. oxyacantha), barberry  Berberis vulgaris, and pyracantha  Pyracantha coccinea have all been thought to be the plant named by the Greek and post-classical Latin words. In later post-classical Latin use Oxyacantha (or, less frequently, Oxyacanthus) was applied especially to the hawthorn, and was used as a specific epithet by Linnaeus ( Species Plantarum (1753) I. 477).
 Botany. 
Obsolete. 
rare. Apparently only attested in dictionaries or glossaries.
1857    R. G. Mayne  		(1860)	  				Oxyacanthus,..having numerous sharp thorns, as the Rosa oxyacantha: oxyacanthous.
 This entry has been updated (OED Third Edition, March 2005; most recently modified version published online June 2021).