Radiomicrometer (n.)
definition: A very sensitive modification or application of the thermopile
Used for indicating minute changes of radiant heat or temperature.
Radiomicrometer is a 15 letter word that begins with an R and ends in an R

Ranz des vaches
definition: The name for numerous simple
But very irregular melodies of the Swiss mountaineers blown on a long tube called the Alpine horn and sometimes sung.
Ranz des vaches is a 15 letter word that begins with an R and ends in an S

Rationalistical (a.)
definition: Belonging to
Or in accordance with the principles of rationalism.
Rationalistical is a 15 letter word that begins with an R and ends in an L

Rationalization (n.)
definition: The act or process of rationalizing.

Rationalization is a 15 letter word that begins with an R and ends in an N

Re-presentation (n.)
definition: The act of re-presenting
Or the state of being presented again; a new presentation; as re-presentation of facts previously stated.
Re-presentation is a 15 letter word that begins with an R and ends in an N

Reafforestation (n.)
definition: The act or process of converting again into a forest.

Reafforestation is a 15 letter word that begins with an R and ends in an N

Reapportionment (n.)
definition: A second or a new apportionment.

Reapportionment is a 15 letter word that begins with an R and ends in a T

Recognizability (n.)
definition: The quality or condition of being recognizable.

Recognizability is a 15 letter word that begins with an R and ends in a Y

Reconsideration (n.)
definition: The act of reconsidering
Or the state of being reconsidered; as the reconsideration of a vote in a legislative body.
Reconsideration is a 15 letter word that begins with an R and ends in an N

Reconsolidation (n.)
definition: The act or process of reconsolidating; the state of being reconsolidated.

Reconsolidation is a 15 letter word that begins with an R and ends in an N

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