Pronunciation: ˌ p ī (- ə )r- ˌ h ē -l ē - ' ä-m ə -t ə r, ˌ pir-
Function: noun
Etymology: International Scientific Vocabulary
Date: 1863
: an instrument for measuring the sun's radiant energy as received at the earth
– pyr · he · lio · met · ric \ -l ē - ə - ' me-trik \ adjective