grão [Portuguese]

In Portugal, two units:

A unit of mass, about 49.766 milligrams (about 0.768 grain).
A unit of length, about 4.58 millimeters¹ (about 0.18 inch).

1. Mappas das Medidas do Novo Systema Legal comparadas com as Antigas nos Diversos Concelhos do Reino e Ilhas.
Lisbon: Imprensa Nacional, 1868.
Page 298.