| 释义 |
▪ I. columnal, a.|kəˈlʌmnəl|
[f. column + -al1.]
= columnar.
1767Bush Hibernia Cur. (1769) 59 Most curious columnal combination. 1777Hamilton Volcanos in Phil. Trans. LXVIII. 4 Lavas that have taken the columnal form. 1801Southey Thalaba xii. xi, Crag overhanging, nor columnal rock Cast its dark outline there.
▪ II. columnal, n.|kəˈlʌmnəl|
[f. the adj.]
A segment or joint of the stem of a crinoid.
1892F. A. Bather in Ann. & Mag. Nat. Hist. IX. 212 Columnals rather low and alternating in thickness and height. 1914Brit. Mus. Return 212 Two fragments of the ‘shell-bed’ with Crinoid columnals from the Lower Coal Measures. 1955L. H. Hyman Invertebrates IV. xv. 50 The stalk [of crinoids] is supported by a single row of superimposed rounded or pentagonal skeletal pieces termed columnals. |