Origin of mantissa
Examples from the Web for mantissa
The integral part of a logarithm is called the index or characteristic, and the fractional part the mantissa.
Linnæus has described this plant minutely in his Mantissa Plant, so that no doubt remains of its being his maritimus.The Botanical Magazine, Vol. V|William Curtis
Linnæus, however, says that his plant came from India (Mantissa, p. 273).Origin of Cultivated Plants|Alphonse De Candolle
Mantissa Plantarum, generum editionis sextæ et specierum editionis secundæ.Lives of Eminent Zoologists, from Aristotle to Linnus|William MacGillivray
These features fairly enough suit the Mitra filosa, generally, and with reason, supposed to be the V. filaris of the 'Mantissa.'
Word Origin for mantissa
decimal part of a logarithm, 1865, from Latin mantisa "a worthless addition, makeweight," perhaps a Gaulish word introduced into Latin via Etruscan (cf. Old Irish meit, Welsh maint "size").