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Webster 1913 Edition

Rissoid

Ris′soid

,
Noun.
[NL.
Rissoa
, the typical genus ( fr. A.
Risso
, an Italian naturalist) +
-oid
.]
(Zool.)
Any one of very numerous species of small spiral gastropods of the genus
Rissoa
, or family
Rissoidae
, found both in fresh and salt water.

Definition 2025

rissoid

rissoid

English

Noun

rissoid ‎(plural rissoids)

  1. (zoology) Any of the spiral gastropods of the genus Rissoa or family Rissoidae, found both in fresh and salt water.

Etymology

Translingual Rissoa ("the typical genus") +‎ -oid.

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