Quantcast
Merriam-Webster Logo
  • Dictionary
  • Thesaurus
  • Scrabble
  • Spanish Central
  • Learner's Dictionary
1

hydroid

play
adjective hy·droid \ˈhī-ˌdrȯid\

Definition of hydroid

  1. :  of or relating to a hydrozoan; especially :  resembling a typical hydra



Origin of hydroid

ultimately from New Latin Hydra


First Known Use: circa 1864


2

hydroid

noun hy·droid

Definition of hydroid

  1. :  hydrozoan; especially :  a hydrozoan polyp as distinguished from a hydrozoan jellyfish



1865

First Known Use of hydroid

1865


Medical Dictionary

1

hydroid

play
adjective hy·droid \ˈhī-ˌdrȯid\

Medical Definition of hydroid

  1. :  of or relating to a hydrozoan; especially :  resembling a typical hydra




2

hydroid

noun hy·droid

Medical Definition of hydroid

  1. :  hydrozoan; especially :  a hydrozoan polyp as distinguished from a medusa




Learn More about hydroid


Seen and Heard

What made you want to look up hydroid? Please tell us where you read or heard it (including the quote, if possible).

WORD OF THE DAY

a timid, meek, or unassertive person

Get Word of the Day daily email!

WORD GAMES

Take a 3-minute break and test your skills!

alt-5746713d76276

Which of these is a synonym of nonplus?

disapprove soothe perplex reduce
Name That Thing

Test your visual vocabulary with our 10-question challenge!

TAKE THE QUIZ
SCRABBLE® Sprint

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ