Ka Class photograph from NZR (now defunct) publicity ...Found on http://en.wikipedia.org/wiki/Bivoltine
bivoltine 1. Of certain silkworms: producing two broods per annum. 2. There are multivoltines. Some species produce one, two, three, four, six, or even eight broods per annum, and in the commercial world are distinguished as, univoltines, bivoltins, trivoltins, quadrivoltins, etc.Found on http://www.wordinfo.info/words/index/info/view_unit/2728/3
Having two broods.
Found on http://www.butterfly-guide.co.uk/help/gloss.htm
having two generations per yearFound on http://www.kerbtier.de/Pages/Glossar/enGlossar.html
Having two generations per year.Found on http://www.earthlife.net/insects/glossary.html
two generations per year.Found on http://www.encyclo.co.uk/local/22036
No exact match found