noun-modifying (irregular)
round; spherical; globe-shaped; lens-shaped
Prenominal adjective describing something that is round, spherical, or shaped like a globe or lens. Often used in technical or descriptive contexts, such as 玉型のレンズ (round lens) or 玉型のガラス (spherical glass).
この時計は玉型の文字盤が特徴です。
This watch features a round dial.
玉型のガラス容器に花を生ける。
I arrange flowers in a spherical glass vase.
Compound of 玉 (たま, 'ball, jewel') and 型 (かた, 'shape, type'), with rendaku voicing of かた to がた. The exact historical derivation is uncertain, but the word is conventionally associated with round or spherical shapes.