acumen

noun acumens · acumina

1. uncountable, usually Quickness of perception or discernment; penetration of mind; the faculty of nice discrimination; acuity of mind. "I am going to ask you a question that does not require much legal acumen to answer," said Lord Meersbrook to his attorney, when he called the next day in Lincoln's Inn;...

   Similar: sharpness, penetration, keenness, shrewdness, acuteness, acuity, wits, foxiness, intelligence, canniness

2. uncountable, usually A sharp, tapering point extending from a plant. The black star of the corolla, characteristic of the original form, the manyfloweredness of the inflorescence (often connected with [3]—4 whirls), upper leaves in the inflorescence, adpression of the acumina of the calyx, its size, the closely situated anthers, long pistils, the length of the pedice
3. uncountable, usually A bony, often sharp, protuberance, especially that of the ischium. The rostrum is the anterior extension of the carapace between the eyes. It ends in a more or less acute tip, or acumen, and may have a lateral spine on each side or bear a longitudinal keel (carina) on the dorsal surface.