[ad. Du. lakmoes, f. lak LAC sb.1 + moes pulp.] = LITMUS.

1

1794.  Sullivan, View Nat., I. 258. The tincture of lacmus.

2

1812.  J. Smyth, Pract. of Customs (1821), 150. Litmus, or Lacmus, in the Arts, is a blue pigment, formed from Archil.

3