A group of similar things or people positioned or occurring closely together
clusters of berries
A fly that often enters buildings in large numbers during the autumn while looking for a place to overwinter
Another term for guar.
A bomb that releases a number of projectiles on impact to injure or damage personnel and vehicles
A compound consisting of or containing a group of metal atoms (sometimes associated with non-metal atoms) linked together by covalent or coordinate bonds.
A chord containing a number of closely adjacent notes
A relatively loose grouping of stars
Another term for note cluster.
A geographic area with a statistically higher than average occurrence of cancer among its residents
A cluster of galaxies.
An open cluster of stars which appear to share a common motion through space, and the distance of which can be determined from measurements of the motions of the individual stars.
A type of severe headache that tends to recur over a period of several weeks and in which the pain is usually limited to one side of the head
The cluster of stars including the sun and the Milky Way (now disused).
A large compact spherical star cluster, typically of old stars in the outer regions of a galaxy
An attachment to a military decoration depicting a twig with oak leaves and acorns, indicating distinguished action or a subsequent award of the same decoration
A disastrously mishandled situation or undertaking
A cluster of galaxies which themselves occur as clusters
Attributive and in the possessive. Designating rich galaxy clusters listed in Abell's catalogue; relating to such clusters. Frequently in Abell cluster.