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Webster 1913 Edition

Adj.

[L.

ponderabilis

: cf. F.

pondérable

Capable of being weighed; having appreciable weight.

–

Pon′der-a-ble-ness

Noun.

Adj.

That may be weighed; capable of being weighed.

See also: pondérable

ponderable ‎(comparative more ponderable, superlative most ponderable)

(physics) Having a detectable amount of matter; having a measurable mass.
Worthy of note; significant, interesting.
- 1936, Djuna Barnes, Nightwood, Faber & Faber 2007, p. 77:
  The very mother's head you swore by in the dock is a heavier head, crowned with ponderable hair.