American Heritage Dictionary
(2)
Century Dictionary
(4)
GNU Webster's 1913
(1)
WordNet
(1)
Elsewhere on the web
Tooth orientation: M: mesial, D: distal, V: vestibular, and L: lingual.— PLoS ONE Alerts: New Articles
However, the three mesial cusps display highly variable size and position.— PLoS ONE Alerts: New Articles
The most mesial element varies from a large rounded cusp (arrowed in Fig. 2P).— PLoS ONE Alerts: New Articles
The T2 encompasses four cusps, three mesial interconnected and an isolated distal one.— PLoS ONE Alerts: New Articles

Century Dictionary (1)
Bubble size: how much this word was used in a year
Bubble height: used more or less than expected, vs. all uses evenly distributed
You can expect to see this word about once a year.
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