a grouping of a number of similar things

come together as in a cluster or flock

gather or cause to gather into a cluster

drought-tolerant herb grown for forage and for its seed which yield a gum used as a thickening agent or sizing material

bomb consisting of a canister that is dropped from a plane and that opens to release a cluster of bomblets (usually fragmentation bombs) over a wide area

one of the smaller bombs that are released from a cluster bomb

a painful recurring headache associated with the release of histamine from cells

a glycoprotein that is found primarily on the surface of helper T cells

a membrane glycoprotein that is found primarily on the surface of cytotoxic T cells

growing close together but not in dense mats

clustered together but not coherent

bellflower of Europe to temperate Asia having dense spikes of violet-blue to white flowers

clusters of several short stems each having 2 broad leaves and 2-4 drooping brownish to greenish flowers with pouches mottled with purple; British Columbia to central California and northern Colorado

densely hairy perennial having mostly triangular basal leaves and rose-purple flowers in panicled clusters

a grouping of a number of similar things