Definition of "hectacre"

In Maryland, I have about six woody plant species per hectacre. (One hectacre, a metric measurement, equals 2.47 acres.)

2001, James A. Duke, Michael Castleman, The Green Pharmacy Anti-Aging Prescriptions, page 8

ha hectacre (2.5 acres)

2007, Thomas T. Samaras, Human Body Size and the Laws of Scaling page 335 (list of abbreviations)

This deforestation in the name of beef has meant the loss of 10 million hectacres in the Brazilian Amazon since 1996. You don't even have to know what a hectacre is to know the situation is severe (btw a hectacre is 10,000 square meters, […] ).

2009, Jen Pleasants, Bag Green Guilt, 5 Easy Steps, page 37