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Mast"less (?), a. [See lst
Mast.] Bearing no mast; as, a mastless oak or
beech. Dryden.

Mast"less, a. [See 2d Mast.]
Having no mast; as, a mastless vessel.

Mast"lin (măst"l&ibreve;n), n.
See Maslin.

Mas"to*don (?), n. [Gr.
masto`s the breast + 'odoy`s,
'odo`ntos, a tooth. So called from the conical projections
upon its molar teeth.] (Paleon.) An extinct genus of
mammals closely allied to the elephant, but having less complex molar
teeth, and often a pair of lower, as well as upper, tusks, which are
incisor teeth. The species were mostly larger than elephants, and
their remains occur in nearly all parts of the world in deposits
ranging from Miocene to late Quaternary time.

||Mas`to*don*sau"rus (?), n. [NL., fr.
E. Mastodon + Gr. say^ros a lizard.]
(Paleon.


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