Barinade

Bio-Electric Anemone: Barinade (電撃旋回虫バリネード) is the boss of Inside Jabu-Jabu's Belly, the third dungeon in The Legend of Zelda: Ocarina of Time. This parasitic organism is what is feeding off of Lord Jabu-Jabu. It also has some sort of symbiotic relationship with Bari.

Battle
The boss consists of four parts, each of which involving attacks that deplete one quarter of a heart. First, it fires beams of electricity at Link. Link needs to aim the Boomerang at the tentacles attaching Barinade to the ceiling. Once he has severed the tentacles, Barinade will spin several Bari around itself while chasing after Link, who must aim the Boomerang at Barinade's main body to stun it. Once stunned, Link must use the Boomerang to defeat the now stationary Bari, leaving the main body of Barinade completely vulnerable to attack. Barinade now shoots several beams of electricity at Link, which Link can sidestep and retaliate to with his Boomerang. Link then follows up the preemptive strike with several sword slashes until Barinade recovers and repeats the process until it can take no more. Upon its defeat, Barinade explodes in a mess of pus, and Princess Ruto is freed. She gives Link the Zora's Sapphire, the third Spiritual Stone, as a reward.

Video
This clip was provided by lleeoo2010 78j_C6ZKFPg

Etymology
Barinade's name possibly originated from the jellyfish-like Bari, with whom Barinade seems to have a connection.