Aquatic Ecology Terminology

noun a low dam built across a river to raise the level of water upstream or regulate its flow

• The engineers constructed a weir to control the water flow in the river.
• We found a cool spot to swim near the weir.
• Let's hang out by the weir and chill.
• The weir in our relationship was finally resolved through open communication.

noun small tentacle-like structures found on certain marine invertebrates

• The actinulae are specialized structures found in certain marine invertebrates.
• I read about actinulae in my marine biology class.
• Those actinulae thingies are pretty cool, huh?
• The actinulae of society are the individuals who stand out and make a difference.