na-adjective, noun which may take the genitive case particle 'no', noun
thicker towards the end; club-shaped
Describes an object that is narrow at one end and gradually widens toward the other end, like a baseball bat or a club.
このバットは先太の形状をしている。
This bat has a club-shaped form.
先太のデザインのペン
A pen with a thicker end design is easy to grip.
Compound of 先 (saki, 'tip, end') and 太 (futo, 'thick'). The reading さきぶと is a straightforward combination of the kun'yomi readings.