A spinet (virginal) is a keyed musical instrument of the harpsichord type, but with only one string to a note and therefore less volume. It is generally square in shape and the strings are plucked.
Spinets were popular between 1500 and 1760 especially during the reign of Elizabeth I in England. Research Spinet
The virginal was a musical instrument used in the 16th century and somewhat resembling the spinet, but having a rectangular form, like a small piano. It had strings and keys, but only one wire to a note. Research Virginal