a. Bot. [f. as TRANSVERSE a. + -AN.] (See quot.)
1900. B. D. Jackson, Gloss. Bot. Terms, 274/1. Transversan Plane, that which passes through the centre of a Diatom frustule vertically to the pervalvar axis (O. Mueller).
a. Bot. [f. as TRANSVERSE a. + -AN.] (See quot.)
1900. B. D. Jackson, Gloss. Bot. Terms, 274/1. Transversan Plane, that which passes through the centre of a Diatom frustule vertically to the pervalvar axis (O. Mueller).
