The smallest liquid measure, equal to about one drop; the sixtieth part of a fluid drachm, equal to one four-hundred-eightieth of a fluid ounce, or 0.06161 milliliter (U. S. measure) or 0.05919 milliliters (British measure).
A time note, formerly the shortest in use; a half note, equal to half a semibreve, or two quarter notes or crotchets.