Merriam-Webster's Collegiate® Dictionary, 11th Edition
SWARM
I. noun
Etymology: Middle English, from Old English swearm; akin to Old High German swaram swarm and probably to Latin susurrus hum Date: before 12th century
1. a great number of honeybees emigrating together from a hive in company with a queen to start a new colony elsewhere, a colony of honeybees settled in a hive,
2. a large number of animate or inanimate things massed together and usually in motion ; throng , a number of similar geological features or phenomena close together in space or time ,
II. verb
Date: 14th century
intransitive verb to form and depart from a hive in a swarm,
2. to move or assemble in a crowd ; throng , to hover about in the manner of a bee in a swarm, to contain a swarm ; teem , transitive verb to fill with a swarm, to beset or surround in a swarm , swarmer noun
III. verb
Etymology: origin unknown
Date: 14th century
intransitive verb to climb with the hands and feet, transitive verb to climb up ; mount