orthotriæne
(ˈɔːθəʊtraɪˌiːn)
[f. ortho- ‘right’ + Gr. τρίαινα trident.]
A triæne or tridentate sponge spicule, whose three prongs or cladi project at right angles from the shaft; a simple spicule of the rhabdus type, with three secondary rays at one end, at right angles with the shaft.
| 1887 Sollas in Encycl. Brit. XXII. 417/1 The arms make different angles with the shaft;..when extended at right angles an orthotriæne. |