The Collaborative International Dictionary of English v.0.48:
Axle \Ax"le\ ([a^]ks"'l), n. [OE. axel, exel, shoulder, AS.
eaxl; akin to AS. eax axle, Sw. & Dan. axel shoulder, axle,
G. achse axle, achsel shoulder, L. axis axle, Gr. 'a`xwn,
Skr. aksha, L. axilla shoulder joint: cf. F. essieu, axle,
OF. aissel, fr. dim. of L. axis. [root]205. Cf. 2d Axis.]
1. The pin or spindle on which a wheel revolves, or which
revolves with a wheel.
2. A transverse bar or shaft connecting the opposite wheels
of a car or carriage; an axletree.
3. An axis; as, the sun's axle.
Had from her axle torn
The steadfast earth. --Milton.
Note: Railway axles are called leading and trailing from
their position in the front or in the rear of a car or
WordNet (r) 3.0 (2006):
n 1: a shaft on which a wheel rotates
The Free On-line Dictionary of Computing (30 December 2018):
An early string processing language in which a
program consists of an "assertion table" specifying patterns
and an "imperative table" specifying replacements.
["AXLE: An Axiomatic Language for String Transformations",
K. Cohen et al, CACM 8(11):657-661, Nov 1965].