The root of this word is new to me. Seems that it should
have been useful enough to be common.
Date: Sun Jan 1 00:03:37 EST 1995
Subject: A.Word.A.Day--equipollent
equi.pol.lent \-*nt\ aj [ME, fr. MF, fr. L aequipollent-, aequipollens, fr.
aequi- eq]ui- + pollent-, pollens, prp. of polle-re to be able 1: equal in
force, power, or validity 2: the same in effect or signification -
equipollent n

I was reminded of "pollen" so looked up its etymology:
pollen

SYLLABICATION: pol·len
PRONUNCIATION: pln
NOUN: The fine powderlike material consisting of pollen grains that is produced by the anthers of seed plants.
ETYMOLOGY: Latin, fine flour.

So how is "fine flour" related to "power"?