Risoid or Rissoid: How To spell?
The word Risoid is misspelled against Rissoid, a noun meaning "Any one of very numerous species of small spiral gastropods of the genus Rissoa, or family Rissoidae, found both in fresh and salt water."
The word Risoid is misspelled against Rissoid, a noun meaning "Any one of very numerous species of small spiral gastropods of the genus Rissoa, or family Rissoidae, found both in fresh and salt water."