protriaene
/prəʊˈtrʌɪiːn/Zoology
noun
A sponge spicule with three short prongs projecting forwards from one end of a longer ray.
Origin
Late 19th century; earliest use found in William Sollas (1849–1936), geologist and anthropologist. From pro- + triaene.
- civic-mindedness
- civic oath
- civic republicanism
- civics
- civil
- civil aviation
- civil commitment
- civil commotion
- civil conviction
- civil court
- civil crown
- civil death
- civil defence
- civil disobedience
- civil engineer
- civil engineering
- civilian
- civilian casualty
- civilianise
- civilianism
- civilianization
- civilianize
- civilian target
- civilian–military
- civilisade