Inner post

(Naut.) a piece brought on at the fore side of the main post, to support the transoms.

See also: Inner

References in periodicals archive ?
Even if there is no pronounced speed bias, any fit speed horse with an inner post will be playing to Monmouth's tight-turning, 1m dirt oval
Longshot horses who save ground from an inner post - even those with modest early speed - can prove to be lucrative additions to multi-horse exotic wagers
from the edges of the inner posts on each corner as shown in Fig.