Webster's 1913 Dictionary
HYPERICUM
Hy *per "i *cum, n. Etym: [L., fr. Gr. (Bot. )
Defn: A genus of plants, generally with dotted leaves and yellow flowers; -- called also St. John's-wort.
New American Oxford Dictionary
hypericum
hy per i cum |hīˈperikəm haɪˈpɛrəkəm | ▶noun a yellow-flowered plant of a genus that includes the St. John's worts and rose of Sharon. [Genus Hypericum, family Guttiferae. ] ORIGIN Latin, from Greek hupereikon, from huper ‘over, above ’ + ereikē ‘heath. ’
Oxford Dictionary
hypericum
hypericum |hʌɪˈpɛrɪkəm | ▶noun a yellow-flowered plant of a genus that includes the St John's worts, tutsan, and rose of Sharon. ●Genus Hypericum, family Guttiferae. ORIGIN Latin, from Greek hupereikon, from huper ‘over, above ’ + ereikē ‘heath ’.
The Wordsmith Dictionary