Quick Definition
trembling through fear
Strong's Definition
terrified
Derivation: from G1722 (ἐν) and G5156 (τρόμος);
KJV Usage: X quake, X trembled
Thayer's Greek Lexicon
ἔντρομος, ἐντρομον (τρόμος, cf. ἔμφοβος), trembling, terrified: Act_7:32 and ἔντρομος ... γενόμενος, becoming tremulous, made to tremble; Heb_12:21 (Tr marginal reading WH marginal reading ἔκτρομος, which see). (the Sept.; 1Ma_13:2; Plutarch, Fab. 3.)
Mounce Concise Greek Dictionary
ἔντρομος entromos 3x
trembling, terrified, Act_7:32 ; Act_16:29 ; Heb_12:21
Abbott-Smith Greek Lexicon
† ἔν -τρομος , -ον ,
[in LXX : Da TH Dan_10:11 ( H7460 hi .); ἔ . γίγνεσθαι , Psa_18:7 ; Psa_77:18 ( H7494 ), Wis_17:10 , 1Ma_13:2 * ;]
trembling with fear (Pint.): Act_7:32 ; Act_16:29 , Heb_12:21 (ἔκτρ -, WH , mg .).†
Moulton & Milligan — Vocabulary of the Greek NT
ἔντρομος [page 219]
For ἔντρομος ter in the NT cf. ἔκτρομος , not found in the lexicons, but apparently used in the same sense in the great Paris magical papyrus of about A.D. 300 .3076 ὁρκίζω σε . . . τὸν ἐφορῶντα ἐπὶ γῆς καὶ ποιοῦντα ἔκτρομα τὰ θεμίλια αὐτῆς , and maketh tremble the foundations thereof : see Heb_12:21 ΰ D 2 , and cf. Deissmann LAE p. 254 and BS p. 290.
Liddell-Scott — Intermediate Greek Lexicon
ἔντρομος ἔν-τρομος, ον (adj e)n-trom os_on ) [Etym: τρέμω] "trembling", Plut. , NTest.
STEPBible — Tyndale Abridged Greek Lexicon
ἔν-τρομος, -ον
[in LXX: Da TH Dan.10:11 (רָעַד hi.); ἔ. γίγνεσθαι, Psa.18:7 77:18 (רַעַשׁ), Wis.17:10, 1Ma.13:2 * ;]
trembling with fear (Pint.): Act.7:32 16:29, Heb.12:21 (ἔκτρ-, WH, mg.).†
(AS)