1. massing or clumping of materials together. 2. a clumped mass of material. familial aggregation the occurrence of more cases of a given disorder in close relatives of a person with the disorder than in control families. platelet aggregation platelet agglutination.
boule â(plural boules). 1  One of the bowls used in the French game of boules. 2  A single-crystal ingot produced by synthetic means. 3  A round loaf of bread. 4  A round piece of dough. ( 5 woodworking) A through-sawn log with the slices restacked in the order and orientation they originally had in the log, usually with waney edges.
Boron (IPA: /ËbÉËrÉn/) is a chemical element with atomic number 5 and the chemical symbol B. A trivalent compound containing boron occurs abundantly in the ore borax. Boron is never found free in nature, and is a non-metal. Several allotropes of boron exist; amorphous boron is a brown powder, though crystalline boron is black, hard (9.3 on Mohs' scale), and a weak conductor at room temperature.