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plural aristae or aristas
(biology) One of the fibrils found on grains or fishes. quotations
A very distinct species. Habit of Brachystephium scapigerum D. C.: but that ought to have no aristae to the achenium: here the awns are very stout in proportion to the size of the capitulum.
1848, Thomas Mitchell, Journal of an Expedition into the Interior of Tropical Australia […]
(entomology) A bristle on the third segment of a fly's antenna. quotations
The eyes of the male are separated by a distance equal to one-fourth of the diameter of the head, in the female by one-third. The frontal stripe is black, the cheeks and margins of the orbits silvery-white. The antennæ are black, the arista feathered on the upper side only.
1915, O. A. Johannsen, William A. Riley, Handbook of Medical Entomology