protriaenen.

Brit.

/prəʊˈtrʌɪiːn/, U.S.

/proʊˈtraɪˌin/

Origin: Formed within English, by derivation. Etymons: pro- prefix², triaene n.

Etymology: < pro- prefix² + triaene n. Compare anatriaene n., dichotriaene n., orthotriaene n., etc.

Zoology.

A sponge spicule with three short prongs projecting forwards from one end of a longer ray.

ΚΠ

1887 W. J. Sollas in Encycl. Brit. XXII. 417/1 The arms make different angles with the shaft: when recurved a grapnel or anatriæne is produced, when projecting forwards a protriæne, and when extended at right angles an orthotriæne.

1900 E. A. Minchin in E. R. Lankester Treat Zool. ii. iii. 133 The cladi may be directed forwards, i.e. so as to point the opposite way to the shaft (protriaene).

1968 P. Brien in M. Florkin & B. T. Scheer Chem. Zool. II. i. i. 9 The other three branches, which form the head or cladome, are arranged perpendicularly to the shaft (orthotriaene) or obliquely to it (protriaene or anatriaene).

1997 Jrnl. Paleontol. 71 554/2 Fragments of protriaene root tuft spicules..from the Upper Ordovician limestones.

This entry has been updated (OED Third Edition, September 2007; most recently modified version published online March 2022).

单词	protriaene
释义	protriaenen. Brit. /prəʊˈtrʌɪiːn/, U.S. /proʊˈtraɪˌin/ Origin: Formed within English, by derivation. Etymons: pro- prefix², triaene n. Etymology: < pro- prefix² + triaene n. Compare anatriaene n., dichotriaene n., orthotriaene n., etc. Zoology. A sponge spicule with three short prongs projecting forwards from one end of a longer ray. ΚΠ 1887 W. J. Sollas in Encycl. Brit. XXII. 417/1 The arms make different angles with the shaft: when recurved a grapnel or anatriæne is produced, when projecting forwards a protriæne, and when extended at right angles an orthotriæne. 1900 E. A. Minchin in E. R. Lankester Treat Zool. ii. iii. 133 The cladi may be directed forwards, i.e. so as to point the opposite way to the shaft (protriaene). 1968 P. Brien in M. Florkin & B. T. Scheer Chem. Zool. II. i. i. 9 The other three branches, which form the head or cladome, are arranged perpendicularly to the shaft (orthotriaene) or obliquely to it (protriaene or anatriaene). 1997 Jrnl. Paleontol. 71 554/2 Fragments of protriaene root tuft spicules..from the Upper Ordovician limestones. This entry has been updated (OED Third Edition, September 2007; most recently modified version published online March 2022). < n.1887
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