> as lemmas
pre-main-sequence
pre-main-sequence adj.
Brit. 
/ˌpriːmeɪnˈsiːkw(ə)ns/
, /ˌpriːmeɪnˈsiːkw(ə)ns/U.S. /ˌpriˌmeɪnˈsikwəns/
Astronomy designating a star which is too young (and therefore too bright, hot, or small) to belong to the main sequence on a Hertzsprung-Russell diagram; cf. main adj.2/ˌpriˌmeɪnˈsikwəns/ΚΠ
1958 M. Schwarzschild Structure & Evol. Stars iv. 156 The pre-main-sequence phases of stellar evolution represent the contraction of a stellar mass from the state of an interstellar cloud to the initial main-sequence state.
1964 Science 20 Nov. 1032/2 E. Schatzman discusses the pre-main sequence stages in great theoretical detail.
1979 C. Payne-Gaposchkin Stars & Clusters iii. 44 Pre-main-sequence stars are gravitationally fed; main-sequence stars are devouring hydrogen.
2003 Economist (Nexis) 22 Nov. An astronomer, presumably with a sense of humour, named this type of object a PMS (pre-main sequence) star. HD 100546 has not yet started ‘burning’ hydrogen.
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as lemmas
- to face a person with a lie
- to face about
- to face and brace
- to face down
- to face facts
- to face it out
- to face out
- to face out a etc
- to face out a matter
- to face out of
- to face out of countenance
- to face out with a card of ten
- to face right about
- to face something out with a card of ten
- to face the facts
- to face the music
- to face the racket
- to face up to
- to face with
- to face with a card of ten
- to face with a lie
- to factor in
- to factor into
- to factor out
- to factor out of